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4:36 AM
1. I've checked with echo $XDG_SESSION_TYPE, it shows X11
2. I guess cog wheel only shows if there's more than one session
 
 
3 hours later…
7:42 AM
You have really tried a lot of things. I must admit that I don't understand what is wrong.
I am not yet sure which flavour of Ubuntu you are trying. If you are not using Lubuntu, I would suggest that you try Lubuntu.

If you are still having problems with 18.04 LTS, I suggest that you return to a previous version, and I would suggest 16.04.1 LTS which is keeping the linux 4.4 kernel series. See this link,

http://cdimage.ubuntu.com/lubuntu/releases/16.04.1/release/
You will find 16.04.1 iso files if you scroll down ...
 
 
2 hours later…
9:45 AM
Okay.. I installed Ubuntu 18.04 in other hdd before upgrading it from 16.04.04..
So no issue with that
and one thing i'm not getting is why this issue not occur in 'Try Ubuntu' session
@sudodus
I did not need to set nomodeset
 
Standard Ubuntu has a modern and advanced desktop environment, and there is some automatic detection of hardware, that might not work correctly for you old graphics chip. (In the live session 'Try Ubuntu' several drivers are there, so it works, but the correct driver will obviously not be selected for the installed system. I don't know how to fix that, but if you are lucky, someone else might know and be able to help you.
 
okay.Thanks though
 
10:00 AM
You might have better luck with Lubuntu or Xubuntu, which have light-weight desktop environments. Or you can install a text mode version.
Text mode versions are installed from the Ubuntu `mini.iso`files, that you find at

http://cdimages.ubuntu.com/netboot/
If the installation works, and you get a working text mode system, you can try with some simple window manager, for example install the three packages fluxbox xinit xterm' and switch to graphic mode with startx`.
You can also install lubuntu-core or xubuntu-corebut then there will be graphical login screen, which might not work.
So after installation, login in text mode and run

sudo apt install fluxbox xinit xterm

and you should get a system, that might work for you. (If not, I would recommend Lubuntu 16.04.1 LTS again (with the link that I posted earlier).
 

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