Comment 12 for bug 1799855

lubuntu 18.04.2 qa-test install: virtual machine on sony vaio ultrabook (i5-9400u, 4gb, intel haswell-ULT); host is lubuntu 19.04

I didn't use `vim` to change sources, but found I could achieve equivalent with synaptic [package manager] which was pre-installed on Lubuntu 18.04; settings->repositories and selecting using drop down australia->ftp.iinet.net.au. i made no other changes
(note: mine wasn't identical, I don't recall adding -backports & had 'main universe multiverse restricted' for bionic, -updates, -security)

i `sudo vi /etc/update-manager/release-upgrades` ("=normal"); `sudo apt update` (probably pointless but ..)

`do-release-upgrade -p`

..
6 installed packages are no longer supported by Canonical. You can ..
..
on questions I used default (eg. lightdm as it was highlighted, not sddm or what I assume most users would do), package-maintainers-version, (y) remove obselete packages (probabe some users are likely to choose no for this), reboot (y)

login (after reboot), brief explore & it's LXQt desktop, reboot(vm) & again login and [still] looks correct

            .-/+oossssoo+/-. guiverc@lubu-sru-test
        `:+ssssssssssssssssss+:` ---------------------
      -+ssssssssssssssssssyyssss+- OS: Ubuntu 18.10 x86_64
    .ossssssssssssssssssdMMMNysssso. Host: VirtualBox 1.2
   /ssssssssssshdmmNNmmyNMMMMhssssss/ Kernel: 4.18.0-15-generic
  +ssssssssshmydMMMMMMMNddddyssssssss+ Uptime: 2 mins
 /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/ Packages: 2188 (dpkg)
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Shell: bash 4.4.19
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Resolution: 800x600
ossyNMMMNyMMhsssssssssssssshmmmhssssssso DE: LXQt
ossyNMMMNyMMhsssssssssssssshmmmhssssssso WM: Openbox
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Theme: Arc-Darker [GTK3]
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Icons: Adwaita [GTK3]
 /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/ Terminal: qterminal
  +sssssssssdmydMMMMMMMMddddyssssssss+ CPU: Intel i5-4200U (1) @ 2.294GHz
   /ssssssssssshdmNNNNmyNMMMMhssssss/ GPU: VMware SVGA II Adapter
    .ossssssssssssssssssdMMMNysssso. Memory: 357MiB / 985MiB
      -+sssssssssssssssssyyyssss+-
        `:+ssssssssssssssssss+:`
            .-/+oossssoo+/-.