Discussion between psusi and Eray - 2012-04-20

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1:31 PM

2

Q: Can't repair GRUB

I'm trying to repair my GRUB after Windows 7 installation. I have a live 64bit Ubuntu CD. I'm following this answer's steps . But in 6th step I'm getting /usr/sbin/grub-probe: error while loading shared libraries: libdevmapper.so.1.02.1: wrong ELF class: ELFCLASS32 after executing update-grubc...

It looks like your installed system is in fact, not 64 bit.

@psusi , why? how?

Actually it looks like it might just some files that are 32bit. See what file /lib/libdevmapper.so.1.02.1 and file /usr/sbin/grub-probe say ( while within the chroot ).

@psusi , please check my Note 2

First you said you were using a 64 bit livecd, now 32. Which is it? You need to use the 64 bit one.

1:31 PM

@psusi , i have 32 bit AND 64 bit live cd's. You said your system 32bit because of this i tried with 32Bit livecd.

The error message indicated that the library is 32bit when it needs to be 64... check it ( the one on the hd, not the livecd ) with file

hello

I checked them? on note 2.

you checked the copy on the livecd

of the library

and /sbin/init on the hd

/lib/libdevmapper.so.1.02.1 this file on live cd?

yes... you need to check the copy on the hd instead

1:39 PM

sorry. how can i find it ?

it was complaining that that file is 32bit, when the system otherwise is 64

mount the hd like you did before for /sbin/init

i have 64 bit and 32 bit live cds

i can use them

stick to 64

ok

i tried that, you are talking about irrational John's 2nd update (askubuntu.com/a/123320/17345) right ?

> ubuntu@ubuntu:~$ sudo mkdir /mnt/ubusda3
> ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/sda3 /mnt/ubusda3
> ubuntu@ubuntu:~$ file /mnt/ubusda3/sbin/init
> /mnt/ubusda3/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped

yes

1:42 PM

here my results :

> ubuntu@ubuntu:~$ sudo mkdir /mnt/ubusda3
> ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/sda3 /mnt/ubusda3
> ubuntu@ubuntu:~$ file /mnt/ubusda3/sbin/init
> /mnt/ubusda3/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped

so /sbin/init on the hd is 64bit, which would indicate that it's a 64bit system... but the original error you got complained about that library being 32 bit, so check that library instead... if init is 64bit and the library is 32bit, that would be the problem

how can i check that library instead?

change /sbin/init to /lib/libdevmapper.so.1.02.1

now i'll boot with 64bit live cd and then execute this command directly : file /lib/libdevmapper.so.1.02.1 right ?

1:56 PM

no, that is the one on the livecd... you need to prefix it with the path to where you mount the hd

um.. sorry i don't know this processes very well. I don't know how can i do it.

if you mounted the hd in /mnt/ubusda3 then that's the prefix

2:15 PM

of ok i'll execute this command : `file /mnt/ubusda3/lib/libdevmapper.so.1.02.1

2:45 PM

well?

i'm sorry, i had to go lunch. Now i'll trying it. Just a minute please

ok

now i'm on 64bit live cd

> ubuntu@ubuntu:~$ sudo su
> root@ubuntu:/home/ubuntu# mkdir /mnt/ubusda3
> root@ubuntu:/home/ubuntu# mount -t ext4 /dev/sda3 /mnt/ubusda3
>root@ubuntu:/home/ubuntu# file /mnt/ubusda3/lib/libdevmapper.so.1.02.1
> /mnt/ubusda3/lib/libdevmapper.so.1.02.1: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped

3:25 PM

yep, somehow you got the 32 bit version of that library installed on a 64 bit system

how can we fix it? And if we fix it, can we solve my grub problem?

chroot into the hd and see what version it thinks is installed... chroot /mnt/ubusda3, then apt-cache policy libdevmapper1.02.1

> root@ubuntu:/home/ubuntu# file /mnt/ubusda3/sbin/init
> /mnt/ubusda3/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped
> root@ubuntu:/home/ubuntu# file /mnt/ubusda3/lib/libdevmapper.so.1.02.1
> /mnt/ubusda3/lib/libdevmapper.so.1.02.1: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped

paste the wrong thing?

opps sorry

> root@ubuntu:/# apt-cache policy libdevmapper1.02.1
> libdevmapper1.02.1:
> Installed: 2:1.02.48-4ubuntu3
> Candidate: 2:1.02.48-4ubuntu3
> Version table:
> *** 2:1.02.48-4ubuntu3 0
> 500 http://tr.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
> 100 /var/lib/dpkg/status

( i executed chroot /mnt/ubusda3/ before apt-cache)

3:39 PM

hrm... what does md5sum /lib/libdevmapper1.02.1 show? ( still inside the chroot )

and cat /var/lib/dpkg/info/libdevmapper1.02.1.md5sums

> ubuntu@ubuntu:~$ sudo su
> root@ubuntu:/home/ubuntu# chroot /mnt/ubusda3
> root@ubuntu:/# md5sum /lib/libdevmapper1.02.1
> md5sum: /lib/libdevmapper1.02.1: No such file or directory
> root@ubuntu:/# md5sum /lib/libdevmapper.1.02.1
> md5sum: /lib/libdevmapper.1.02.1: No such file or directory
> root@ubuntu:/# md5sum /lib/libdevmapper.so.1.02.1
> 262cd47e4925fe7b2a4125f3d2686405 /lib/libdevmapper.so.1.02.1
> root@ubuntu:/# cat /var/lib/dpkg/info/libdevmapper1.02.1.md5sums
> 4d638d449789e47369979f3ff16a0655 lib/libdevmapper.so.1.02.1

err, md5sum /lib/libdevmapper.so.1.02.1

forgot the so

yes i add it. you can see at 7th line

added*

ahh, yea... weird... somehow you installed the 64 bit version of the package like normal, and have since replaced that specific file with the 32bit version

so reinstall the package... run apt-get install --reinstall libdevmapper1.02.1

how can i replace this file with original 64 bit ?

ok just a minute

(inside chroot)

root@ubuntu:/# apt-get install --reinstall libdevmapper1.02.1
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 6 not upgraded.
Need to get 70.0 kB of archives.
After this operation, 0 B of additional disk space will be used.
Err http://tr.archive.ubuntu.com/ubuntu/ oneiric/main libdevmapper1.02.1 amd64 2:1.02.48-4ubuntu3
Temporary failure resolving 'tr.archive.ubuntu.com'
Failed to fetch http://tr.archive.ubuntu.com/ubuntu/pool/main/l/lvm2/libdevmapper1.02.1_1.02.48-4ubuntu3_amd64.deb Temp…

3:48 PM

ping www.ubuntu.com?

PING www.ubuntu.com (91.189.90.40) 56(84) bytes of data.
64 bytes from avocado.canonical.com (91.189.90.40): icmp_req=1 ttl=53 time=63.4 ms
64 bytes from avocado.canonical.com (91.189.90.40): icmp_req=2 ttl=53 time=63.8 ms

hrm... ping tr.archive.ubuntu.com

PING ftp.linux.org.tr (193.140.100.100) 56(84) bytes of data.
64 bytes from ftp.linux.org.tr (193.140.100.100): icmp_req=1 ttl=55 time=28.1 ms
64 bytes from ftp.linux.org.tr (193.140.100.100): icmp_req=2 ttl=55 time=28.2 ms

hrm.. ok, retry the apt-get

same error

can't i use en.archive.ubuntu.com for example?

3:50 PM

you could, but there doesn't appear to be anything wrong with tr

opps

just a minute

that's really weird that apt says it can't resolve it, but ping has no trouble

there are 2 terminal windows opened recently. and one of them chrooted .

if i try to ping tr.archive.ubuntu.com with chrooted terminal

i'm getting unknown host tr.archive.ubuntu.com error

ahh

ok... cat /etc/resolve.conf in both terminals, the chrooted one is probably wrong

if i try pinging with normal (new) terminal screen

it's pinging with no errors

3:52 PM

err, just resolv.conf, no e

i can execute apt-get command in normal terminal ?

no

cat /etc/resolv.conf in both terminals

you probably just need to copy the correct one into the chroot

ok

(chrooted)
root@ubuntu:/# cat /etc/resolv.conf
# Generated by NetworkManager

(normal)
ubuntu@ubuntu:~$ cat /etc/resolv.conf
# Generated by NetworkManager
domain domain.name
search domain.name
nameserver 192.168.1.1

now i'm executing apt-get at chrooted terminal

(same error)

yea, the one in the chroot is empty... do this in the chroot:

echo nameserver 192.168.1.1 >> /etc/resolv.conf

then try apt-get again

root@ubuntu:/# echo nameserver 192.168.1.1 >> /etc/resolv.conf
root@ubuntu:/# apt-get install --reinstall libdevmapper1.02.1
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 6 not upgraded.
Need to get 70.0 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://tr.archive.ubuntu.com/ubuntu/ oneiric/main libdevmapper1.02.1 amd64 2:1.02.48-4ubuntu3 [70.0 kB]

3:58 PM

oh boy, looks like you have other libraries that have been replaced with the 32bit version as well

maybe i should remove libdevmapper and then install it again. reinstalling not working

looks like libbz2 is also 32 bit... not going to be able to do much without that working

I think at this point your system is so hosed up you're just going to have to reinstall

oh please :/ there are too many files, application for backup

did you recently restore a backup you made of a 32bit system?

i don't have 32 bit system

ubuntu and windows 64 bit

4:00 PM

did you in the past, and made a backup of it, and recently restored that backup?

opps sorry i misunderstood you.

no i don't restore

anything

i installed fresh 64bit ubuntu

no restore

I'm wondering how on earth you managed to get all of these libraries replaced with the 32 bit versions ;)

me, too

what happens if i reinstall libbz2 ?

apt-get install --reinstall libbz2 ?

you probably can't

probably get the same error

lets try :)

root@ubuntu:/# apt-get install --reinstall libbz2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libbz2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
bzip2:i386 bzip2

E: Package 'libbz2' has no installation candidate

there is a "i386" . It should be amd64 .

4:03 PM

the correct name of the package is bzip2

Can not write log, openpty() failed (/dev/pts not mounted?)
dpkg-deb: error while loading shared libraries: libbz2.so.1.0: wrong ELF class: ELFCLASS32
dpkg: error processing /var/cache/apt/archives/bzip2_1.0.5-6ubuntu1.11.10.1_amd64.deb (--unpack):
subprocess dpkg-deb --control returned error exit status 127
Errors were encountered while processing:
/var/cache/apt/archives/bzip2_1.0.5-6ubuntu1.11.10.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

:))

err, my bad.. it's libbz2-1.0

Can not write log, openpty() failed (/dev/pts not mounted?)
dpkg-deb: error while loading shared libraries: libbz2.so.1.0: wrong ELF class: ELFCLASS32
dpkg: error processing /var/cache/apt/archives/libbz2-1.0_1.0.5-6ubuntu1.11.10.1_amd64.deb (--unpack):
subprocess dpkg-deb --control returned error exit status 127
Errors were encountered while processing:
/var/cache/apt/archives/libbz2-1.0_1.0.5-6ubuntu1.11.10.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

yea... catch-22

catch-22?

4:06 PM

you can't install the library without already having the library installed

--reinstall ?

I have an idea though... outside the chroot, try this: sudo dpkg --root=/mnt/ubusda3 -i /mnt/ubusda3/var/cache/apt/archives/libbz2-1.0_1.0.5-6ubuntu1.11.10.1_amd64.deb

root@ubuntu:/home/ubuntu# sudo dpkg --root=/mnt/ubusda3 -i /mnt/ubusda3/var/cache/apt/archives/libbz2-1.0_1.0.5-6ubuntu1.11.10.1_amd64.deb
(Reading database ... 196784 files and directories currently installed.)
Preparing to replace libbz2-1.0 1.0.5-6ubuntu1.11.10.1 (using .../libbz2-1.0_1.0.5-6ubuntu1.11.10.1_amd64.deb) ...
Unpacking replacement libbz2-1.0 ...
Setting up libbz2-1.0 (1.0.5-6ubuntu1.11.10.1) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place

root@ubuntu:/home/ubuntu#

now try reinstalling the libdevmapper in the chroot

ok

no errors :))))))

4:11 PM

now hopefully there aren't any other broken libs

root@ubuntu:/home/ubuntu# chroot /mnt/ubusda3root@ubuntu:/# apt-get install --reinstall libdevmapper1.02.1
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 6 not upgraded.
Need to get 0 B/70.0 kB of archives.
After this operation, 0 B of additional disk space will be used.
Can not write log, openpty() failed (/dev/pts not mounted?)
(Reading database ... 196784 files and directories currently installed.)

now go back and try to repair grub

which way? with steps from this question : askubuntu.com/questions/88384/… ?

and last questions. Should i reinstall libbz2 , too?

you already did libbz2

you just used the copy of dpkg on the livecd to reinstall it to the hd, rather than using the copy of apt-get from the hd

( which couldn't work without libbz2 )

as long as there are no other libs that are broken, you should be good to go now

with these steps : askubuntu.com/questions/88384/… ?

or other way ?

4:19 PM

yes

ok . In 4th step : for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt$i"; done . But i mounted my hd to /mnt/ubusda3 not /mnt . So how should i this? Like this ? : for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt/ubusda3$i"; done

yes

ok. i'll exit from chroot and then do these steps

just a minute please

root@ubuntu:/home/ubuntu# for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt/ubusda3$i"; done
root@ubuntu:/home/ubuntu# sudo chroot /mnt/sda3
chroot: cannot change root directory to /mnt/sda3: No such file or directory
root@ubuntu:/home/ubuntu# sudo chroot /mnt/ubusda3
root@ubuntu:/# update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.0.0-17-generic
Found initrd image: /boot/initrd.img-3.0.0-17-generic
Found linux image: /boot/vmlinuz-3.0.0-16-generic
Found initrd image: /boot/initrd.img-3.0.0-16-generic

i2ll try reinstall grub. grub-install

or is there any fix for mapdevfs error?

that is really weird... I have never heard of "mapdevfs"

but it doesn't look like it's a fatal error

so what do you think is it reinstalled ?

should i restart my system?

4:26 PM

yea

ok i'm restarting now :)

bad news

nothing changed

5:15 PM

hrm... it looks like mapdevfs is part of the installer... it shouldn't be installed on the hd

well?

in the chroot what does which mapdevfs show?

and apt-cache policy ubiquity

just a minute i'll boot with live cdand try it.

Ok how can i find which mapdecs show?

6:13 PM

run "which mapdecs"

err, mapdevfs

/dev/mapdevfs

Sorry

/bin/mapdevfs

weird... that shouldn't be in an installed system, only on the livecd

apt-get remove ubiquity

root@ubuntu:/# apt-get remove ubiquity
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package ubiquity is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.

root@ubuntu:/# apt-cache policy ubiquity
ubiquity:
Installed: (none)
Candidate: 2.8.7
Version table:
2.8.7 0
500 http://tr.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages

i executed them on chrooted terminal

6:35 PM

that's weird.. dpkg -S /bin/mapdevfs

root@ubuntu:/# dpkg -S /bin/mapdevfs
dpkg-query: no path found matching pattern /bin/mapdevfs.

according to apt-file, that files comes from the ubiquity package

did you read my last message

I wonder if whatever you did to muck up your system with those 32 bit libs also involved copying that file without the package being installed... sudo rm /bin/mapdevfs

once you get rid of it, try update-grub again

ok i execute that command

root@ubuntu:/# update-grub
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

6:38 PM

did you forget to setup the bind mounts before chrooting in?

i just mount /dev/sda3 to /mnt/ubusda3 , directly

then you need the for loop with the mount --bind

ok good news

this time there isn't ay error

any*

root@ubuntu:/# update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.0.0-17-generic
Found initrd image: /boot/initrd.img-3.0.0-17-generic
Found linux image: /boot/vmlinuz-3.0.0-16-generic
Found initrd image: /boot/initrd.img-3.0.0-16-generic
Found linux image: /boot/vmlinuz-3.0.0-12-generic
Found initrd image: /boot/initrd.img-3.0.0-12-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 7 (loader) on /dev/sda4
done
root@ubuntu:/#

there you go

ok lets try. give me a few minutes please

Nothing changed booting Windows automatically

6:48 PM

then you must not have grub installed to sda

So? :)

so you need a grub-install

probably anyway.. if you run the bootinfo script it would tell for sure

sourceforge.net/projects/bootinfoscript

I have Super Grub Disk (Rescatux) and Boot-Repair-Disk . I can use one of them

ok here results.txt

paste.ubuntu.com/938724

you appear to have installed syslinux to your mbr, so you need to reinstall grub

grub-install command

ok. firstly i'll mount sda3 and then execute that for loop. . and chroot. and then grub-install command

root@ubuntu:/# grub-install
install_device not specified.
Usage: grub-install [OPTION] install_device
Install GRUB on your drive.

-h, --help print this message and exit
-v, --version print the version information and exit
--modules=MODULES pre-load specified modules MODULES
--boot-directory=DIR install GRUB images under the directory DIR/grub
instead of the /boot/grub directory
--grub-setup=FILE use FILE as grub-setup
--grub-mkimage=FILE use FILE as grub-mkimage

what should i type for install_device on chrooted terminal

?

7:37 PM

ohh, the instructions left out the argument... grub-install /dev/sda

/dev/sda ? or /dev/sda3

root@ubuntu:/# grub-install /dev/sda
Installation finished. No error reported.

just sda

that should do it

restarting...

Grub menu ok :) but ubuntu not opening im getting kernel panic error and capslock and scroll lock flashing.

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Apr '1220

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