Upgrading from Ubuntu 14.04 LTS to 16.04 takes too long and can't know whats happening
1520
How to install software or upgrade from an old unsupported release?
18556
Ubuntu 16.04 slow boot (apt-daily.service)
28799
How do I create a completely unattended install of Ubuntu Desktop 16.04.1 LTS?
11556
Can I smoothly upgrade from one LTS to next LTS release?
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
68597
Will upgrading Ubuntu remove installed software?
26808
Long boot time Ubuntu 18.04
81434
support time of other Ubuntu LTS flavours?
119169
Should I upgrade to 14.04 LTS?
43648
Why isn't an upgrade to 20.04 from 18.04 available yet?
52863
Installed new Antivirus Software now Computer is extremely slow! Can I fix that?
105928
Ubuntu is very slow when Intel SpeedStep is enabled (CPU is not used in full speed)
92807
There's an issue with an Alpha/Beta Release of Ubuntu, what should I do?
56282
16.04 LTS upgrade alert- How to handle it?
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
8535
Long wait time on login
23914
Some applications on Ubuntu 19.10 very slow to start