What good resources exist for an inexperienced user to explain how to safely upgrade Ubuntu Mate to 18.10 from 18.04?
12578
How do I upgrade to a newer version of Ubuntu?
140850
Why does do-release-upgrade on Xubuntu running version 18.04 not offer to update to 20.04.1?
61516
Where can I get the repositories for old Ubuntu versions?
127766
how to upgrade my Debian package with minor changes
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
63176
How can I update to Ubuntu 21.04?
111573
What's the best way to re-enable PPAs/repos after an upgrade?
85935
How do I pre-install Ubuntu for someone (OEM install)?
211
Can I skip over releases when upgrading?
24165
Upgrade to version newer than repositories
120589
How do I install MATE (the desktop environment)?
5882
How to upgrade Ubuntu from an ISO image
35093
Upgrading from the command line?
63514
How do I decide what version of Ubuntu to install?
4660
Should I be offered the option to upgrade to 18.04.1?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?