My 2 cents on this topic... I hope it will help.
Since PSU Clementine is back, I tried to install it again on my laptop with Ubuntu 20.04. I used the default Wine version provided within Synaptic (4.0 as far as I know) to install PSUC, the install finished without any problem but when it was time to create a character, the game became very slow. It was impossible to create any character.
I tried the tutorials above with more recent versions of Wine, with and without PlayOnLinux, taking care of dotnet, trying 32bits and 64bits install, etc... The problem was remaining.
And finally, I excavated an old post I made on this forum... which was dealing with the same problem ! The trick is very simple :
- use PlayOnLinux and create a virtual drive with an old 32 bits version of Wine (yup, it is on purpose). I used the version 3.0
- Install PSU with the Clementine installer (see on Download page), do not forget to create a shortcut towards PSUC.exe or online.exe to make things easier for running the game later.
- Run the game by using PlayOnLinux, download patches, then restart the game.
I also installed the most recent version of dotnet I could (4.7 if I remember well) and DirectX 9, I do not know if it is necessary... who knows
My old post : https://psu-clementine.net/community/index.php?/topic/8627-solved-connection-became-very-slow-because-of-wine-402/#comment-11824
Important note : even if the character selection does not seem laggy anymore, I did not try to create a character and in-game tests at present time. Maybe this evening... Stay tuned
Good news ! I successfully created a character, then went to Moatoob and started a mission \o/. The remaining difficulty is now that option.exe does want to start. I do not understand why.... Not a big problem since I can modify the contents of PsuIlluminus.ini