I've managed to mess up with the updates on my PC running Ubuntu MATE 19.10... nothing seemed to be able to fix the situation... The PC worked but, for example, Wine was uninstalled, trying to re-install it via Synaptic signalised that a lot of other things will be uninstalled (caja, caja plugins, Brave browser, etc.)
Well, I thought it might be a good idea to try to update to Ubuntu MATE 20.04 before re-installing Ubuntu MATE 19.10 from scratch...
And... MAGIC !!!
- WineHQ 5.0 installation works (I use it for Notepad++ and HeidiSQL)
- re-enabled and re-configured the repositories in "Software & Updates" one by one
- apt update / installation issues went away (after several updates / upgrades and re-boots)
- Ubuntu MATE 20.04 runs with Linux Kernel 5.5.2 (after adding some missing i915 firmware files)
- VirtualBox 6.1.2 from virtualbox.org works as expected
- etc.
Notes:
- all the programs I use work as expected (GIMP, Krita, LibreOffice from PPA, Softmaker Office, Remmina form PPA, Clemetine, Vivaldi, Firefox, Thunderbird, Brave, VLC Media Player, MediathekView, Notepadqq, AnyDesk, Eclipse, ukuu, Kindle, KeepassXC, balenaEtcher, etc.).
The issues I've found during the last 6 hours after upgrading to UM 20.04:
- Software Boutique is empty - each category
- Software & Updates - issue reported here gi.repository.GLib.GError: pk-client-error-quark: ... and here software properties gtk crashed... => I made the changes in the "apt" list files and in the "Software & Updates" window, but used the Terminal for "sudo apt update", etc. to avoid the issue
- I had to remove and re-install "Notepadqq" to be able to see the content of the files (the tabs were shown, but not the content)
- Peter Levi's "Variety" - the "Text font" for "wise quotes" was set to "No font" -> fixed by selecting a font from the list
I am very impressed by the upgrade from UM 19.10 to UM 20.04 (even if still in development)
It was the first upgrade (using UM since 16.04) that went really SMOOTH and FIXED all the issues I've encountered due to my mistakes by messing up with "apt". THIS IS SOOOOOOO GREAT
Thank you all involved into the development! YOU ARE GREAT
Looking forward for the final UM 20.04 version