Fresh install of Ubuntu 15.04 vivid wont upgrade

[oldfred]

I did upgrades from 6.06 thru 9.04. And had various upgrade issues, most related to my nVidia card & all its settings.
But then wanted to convert to 64 bit and had to d a new clean install. That worked so well that I now only do clean installs, but add another 25GB as / (root). I keep all data in a separate large data partition, so I can easily mount & link all the folders into all my installs.
I now only use the LTS as my main working install, but have all the other versions installed as well.

You should be backing up anyway, as hard drives fail, users make mistakes, and other failures.
Also best to houseclean first.
discussion of alternatives/strategy backups
https://help.ubuntu.com/community/BackupYourSystem
https://help.ubuntu.com/community/CategoryBackupRecovery

Oldfred's list of stuff to backup May 2011 (still mostly current, see added links below):
http://ubuntuforums.org/showthread.php?t=1748541
Adding extra commands to rsync
http://ubuntuforums.org/showthread.php?t=2260658
More detail on /etc files and others to backup - post #3:
http://ubuntuforums.org/showthread.php?t=1500559
Some files(temp, cache etc) to exclude from /home backup - post #8 by Paddy Landau
http://ubuntuforums.org/showthread.php?t=1883834
http://askubuntu.com/questions/54565...seless-folders

If you backup /home and list of installed apps. You can easily reinstall apps and all the settings for those apps will still be in /home.

[magicphip]

Thanks @olfred for sharing.
So I found my answer, the upgrade from 15.04 to 15.10 is possible as it should be, just by replacing vivid by wily in the /etc/apt/sources.list file, as one might expect. I just did it, no problem encountered, no configuration lost.
Now the system detected a new upgrade (to 16.04), and accepted to process it.

[gh0zt362]

Just to let everyone know. I downloaded and burned a 16.04.1 LTS live cd and it gave me the option since it was installing over 15.04 to upgrade 15.04 to 16.04.1LTS using the disk without formating over all my music .

So if you have the same issue you can upgrade 15.04 directly to 16.04.1LTS with the 16.04.1LTS live CD .

So I was super happy I didnt have to re download from backup disk 80 gigs of music .