How to uninstall older version (15.04) of Ubuntu and install newer(18.04)
413
How do I install Ubuntu?
108128
How to install newer versions of the Linux kernel?
89
How do I remove old kernel versions to clean up the boot menu?
95336
Installing particular versions when repo has newer versions?
102366
How to wipe and install ubuntu?
132293
If I can, how do I install Ubuntu from Ubuntu?
60524
Upgraded to Ubuntu 18.04, but I still have old UI
157221
Reinstalling Ubuntu 15.10: "Removing conflicting operating system files" has been running for almost 24 hours
125976
What Happens When I Upgrade Ubuntu?
72870
Inno Setup uninstaller VersionInfo
10709
Can i upgrade ubuntu without losing my apps and files?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
89011
What's the opposite of 'make install', i.e. how do you uninstall a library in Linux?
76122
How to uninstall Ubuntu from a dual boot system?
64452
Uninstall old kernel Fedora 28 Workstation
109902
Will I lose the already installed applications if I upgrade from ubuntu 18.04 to 20.04
9901
How to upgrade from 18.10 to 19.10, using the command line?