Failed to update in Ubuntu 14.04
10023
'Some index files failed to download' while updating
19288
Update manager doesn't offer an upgrade to the new release
64509
Can't update from official repositories [Error 409]
130118
Ubunutu 18.04 Updates 404 error
85009
`apt update` failed on Debian Linux
76241
"no public key available" while upgrading using update-manager
140371
Update Ubuntu 10.04
107792
Update information outdated, "Failed to fetch cdrom"
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
46424
Cannot update software center repositories
76248
"Failed to start session" after interrupted upgrade to 14.04
94621
archive.ubuntu.com missing raring-updates
63176
How can I update to Ubuntu 21.04?
123455
Unable to update Node JS - keeps returning to old version [Ubuntu 15.04]
11909
404 error with apt-get update, Don't have any PPA's
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
12534
14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed