Ubuntu: Ubuntu 14.04 Interrupted Upgrade causing “No new release found”



Question:

Recently I was updating from Ubuntu 14.04 to 16.04 from terminal. After starting the update, I accidentally closed the terminal process running it. It was the initial stage of the upgrade process and the required packages were being downloaded.

After this, when I opened the software updater, it was prompting for a partial upgrade. From my little knowledge, what I could make out was that the /etc/apt/sources.list was pointing to the new release which is Xenial. So I replaced the sources file with the sources.bak file available in the same location.

Everything looks alright now. But when I again try to upgrade using sudo do-release-upgrade, it is showing No new release found.

What can I do to fix the issue and make the upgrade work?


Solution:1

Delete /var/lib/ubuntu-release-upgrader/release-upgrade-available and try the upgrade command again

sudo rm /var/lib/ubuntu-release-upgrader/release-upgrade-available  

In theory that should call /usr/lib/ubuntu-release-upgrader/check-new-release.

Source - Update available message after installing update


Solution:2

This issue was occurring not because of the interrupted upgrade. I restored my hard disk using the backed up image so that the traces of all the mess are cleaned up. But the same issue was still occurring. So I conclude that this is being caused by something else which must be the topic of this thread. askubuntu question about the same

However the above thread says that the bug causing this is resolved but I am still experiencing this.


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