How to remove effect or upgrade command in ubuntu 14.4LTS

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I want to upgrade our ubuntu 14.4LTS to 16 operating system. So i run upgrade command.
after command run i restart the OS. than system give some error gnome session related and not start operating system.
How can i solved it.

What I have tried:

I want remove the upgrade command effect in the ubuntu 14.4LTS Operating system.

Posted 19-Jul-18 7:14am

Member 13675865

Updated 19-Jul-18 21:33pm

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Patrice T 19-Jul-18 16:13pm

you should try to ask an Ubuntu forum.

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Jochen Arndt · Answer 1 · 2018-07-19T21:33:00

If the upgrade has been performed, there is no way back. But your OS is starting. The Gnome error messages indicate that there is a problem with the graphical interface.

If you know the shell (text console) you can activate that or the recovery mode (AFAIK by pressing ESC during booting to open the Grub console, and selecting Extended - Recovery Mode).

If you don't have a recent backup, use the console to create one now.

In the console you can try to analyse the problem. It might be for example a problem with the drivers for your graphic card.

You might also try to repair the installation (on your own risk):

sudo apt-get -f install
sudo apt-get -f update
sudo apt-get -f upgrade

If nothing helps you have to perform a fresh installation from media and restore your data using the backup. If you don't have experience with the shell, that is the quickest solution anyway.