$ cat upgrade-ubuntu-20.04-22.04-issues.txt

What was broken after the upgrade?

autofs with nfs4 mounts hang
    fix: none
    workaround: force v3 protocol, add nfsvers=3 to all mounts
firefox moved to snap and broke passff native messaging
    fix: none, 
    workaround: remove snap, install tar from mozilla.org
    notes: didn't want my profile under ~/snap anyway.
var/lib filled breaking everything
    investigation: sure ... 18G of friggen snaps
    $ sudo du -hs * | sort -hr | head -n10
    18G	snapd
    17G	docker
    619M	clamav
    315M	apt
    311M	anbox
    137M	dpkg
    133M	plocate
    124M	mysql
    84M	mlocate
    35M	texmf

    fix: created dedicated snapd lvol, migrated stuff
    
custom resolv.conf was overridden, don't recall being prompted for it
    fix: reinstate custom config