Ubuntu – No updates for 14.10

aptdo-release-upgradelsb-release

When I look at

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.10
DISTRIB_CODENAME=utopic
DISTRIB_DESCRIPTION="Ubuntu 14.10"

But my /etc/apt/sources.list is already all vivid (15.04).

Running do-release-upgrade does start the process but says there are 0 packages to be upgraded.

How do I fully update my system to vivid?

Best Answer

I looked at 

apt-cache policy base-files

there I found out, that I pinned something.

I had a file

/etc/apt/preferences.d/vivid-manual-only

which sticks the vivid upgrade to manal upgrade only:

Package: *
Pin: release n=vivid
Pin-Priority: 99

Remove that file and your updates are found by

do-release-upgrade
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