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drm200
April 28th, 2016, 05:42 AM
Ubuntu 14.04

I updated via the software center yesterday. It updated Chrome and some Ubuntu security updates.
On reboot, I received a crash report that I have some obsolete package versions installed: libcgmanager0

If I run the command: apt-cache policy libcgmanager0
the result is:

libcgmanager0:
Installed: 0.24-0ubuntu7.5
Candidate: 0.24-0ubuntu7.5
Version table:
0.39-2ubuntu2~ubuntu14.04.1 0
100 http://us.archive.ubuntu.com/ubuntu/ trusty-backports/main amd64 Packages
*** 0.24-0ubuntu7.5 0
500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
100 /var/lib/dpkg/status
0.24-0ubuntu7.1 0
500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
0.24-0ubuntu5 0
500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages


So I run the command sudo apt-get update .... expecting that it will be updated ...
The update seems to work normally but exits with a warning:

Fetched 4,162 kB in 22s (189 kB/s)
Reading package lists... Done
W: There is no public key available for the following key IDs:
1397BC53640DB551

If I run the command: "apt-cache policy libcgmanager0" I can see that libcgmanager0 did not update after "sudo apt-get update"

Question 1: Why does libcgmanager0 not update when I run "sudo apt-get udpate"? I have enabled backports via "System Settings/Software and Updates/Updates/unsupported updates (trusty-backports)"

Question 2: if I run: $ aptitude why libcgmanager0 .... it outputs: udev Depends libcgmanager0 .... I think udev is part of Ubuntu core ... why do I need to do a unsupported "trusty-backport" update?

Question 3: How do I determine what key ID 1397BC53640DB551 refers to so I can track down what to do next?


I am not sure what next steps I need to take. Security is important to me and I do not wish to do something that would compromise security.

allandeamon
April 28th, 2016, 05:59 AM
This seems to be a problem with Google Chrome repositories. I Just got this errors the first time some hours ago. And I use debian sid (unstable).

Look this.
http://ubuntuforums.org/showthread.php?t=2322420

skyre2
April 28th, 2016, 09:18 AM
That command fixed for me
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 1397BC53640DB551source (https://www.reddit.com/r/linux4noobs/comments/4grdo7/an_error_occurred_w_there_is_no_public_key/d2k4ucy)