Are Ubuntu upgrades not safe?
10069
Are repository lists secure? Is there an HTTPS version?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
77705
Unable to upgrade in ubuntu
109902
Will I lose the already installed applications if I upgrade from ubuntu 18.04 to 20.04
146622
What is a partial upgrade and when is it necessary?
3116
What are the implications of --no-install-recommends (apt-get install)?
87297
Does upgrading Ubuntu respect my existing partitions?
4660
Should I be offered the option to upgrade to 18.04.1?
1771
How to get rid of 'security updates available' warnings?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
97346
Is it possible to skip releases during an upgrade?
967
How can I avoid "please insert CD/DVD" error when updating Ubuntu?
68584
On system restore, will I lose my software updates?
68120
Will upgrading Windows 8 to 8.1 affect Ubuntu?
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
36848
How do I safely install an older/newer version of Python?