Can't update securely and is therefore disabled?
65
What can I do if a repository/PPA does not have a Release file?
76241
"no public key available" while upgrading using update-manager
154848
How can I install 'restricted-extras' offline?
144507
No facility exists in Update Manager to upgrade to a new version, why?
33220
What is a security update?
146117
Update locked within terminal
2917
Why disabling "Secure Boot" is enforced policy when installing 3rd party modules
149984
Can't update or install anything. Ubuntu 3.11.0.14
117457
Is there a way to permanently exclude the kernel from updates?
967
How can I avoid "please insert CD/DVD" error when updating Ubuntu?
16186
Requires installation of untrusted packages?
119943
Where can I find a repository for older unsupported releases?
85943
Can't update or install apps on Ubuntu Touch
107792
Update information outdated, "Failed to fetch cdrom"
38590
How do I suppress the "New release '12.10' available" message?
73053
Unable to lock the administration directory (/var/lib/dpkg/), are you root?
153212
Ubuntu shut down while updating?