Are you doing fresh install for both, or do you have windows 10 already installed?

@oldfred Hmm... Will that harm my 18's installation too?

@BernardWei Windows 10 is already installed

@K7AAY What is secure boot?

@oldfred My board is ASRock H61M-HVS

@oldfred My bios is American Megatrends P2.50 09/18/2012

I did the same. I have windows 10 pre-install on my laptop before I install ubuntu 18.04. I'll post the steps I took, hope that may help.

@BernardWei I'm not on a laptop. This PC was first installed with W7. But story goes and I've installed W10 myself.

So do you have a second drive for Ubuntu or you need to install it on the same drive. I have done it on separate drive on my desktop too.

@BernardWei Same drive. (C:)

A few more questions. are you using UEFI bios and install windows with EFI booting? If so the steps are a lot cleaner as both Windows and Ubuntu will install the EFI boot on the EFI partition, and switch around both boot setup is much simpler. I.e., windows boot manager can see Ubuntu, and Ubuntu boot manager can see Windows, and can boot each other without issues. For MBR Windows installation, it's the old way and will need to chain boot from Grub, not very nice.

I don't remember

The conversation passed to here as AskUbuntu asked me to do this

:P

If you installed Windows 7, you probably used BIOS/MBR configuration. And it looks like you have the latest BIOS which seems like poor support. asrock.com/mb/intel/h61m-hvs/#BIOS Post this in first question to maintain formatting. sudo parted -l If MBR then Windows has to be BIOS install.

@oldfred It's Windows 10

@oldfred I had no problem last time I installed Ubuntu 16

Windows 10 can be installed either BIOS or UEFI. If upgrade from Windows 7 again probably BIOS/MBR, not newer UEFI/gpt. But with UEFI systems and both Ubuntu & Windows, how you boot install media, UEFI or BIOS is then how it installs.

I've booted USB

I think it's BIOS

(For W10)

@oldfred A little sure for Windows 10 that it's BIOS

I'll boot the flash in BIOS mode now with UBUNTU 18 and see if the kernel panic is happening or not

You just need to be sure to boot Ubuntu live installer in BIOS mode. With MBR you have the 4 primary partition limit, but can have one primary partition as and extended partition and an unlimited number of logical partitions.

Secure Boot: intel.com/content/www/us/en/support/articles/000006942/…

Can I test this in another computer?

I'll do this

Stepped out for a bit, looks like you are in good hand. For MBR booting, you need should still install grub on the partition you have your linux, try not to overwrite the windows record in the MBR. You can use EasyBCD to chain boot into linux from windows bootloader. Thei website have a lot of help for you and it is free if you don't use your ubuntu for work stuff.