@illi Hopefully by installing it in Steam it will smooth out how it runs for you. Good luck!
FWIW, I have the game, ArcDPS, GW2 Radial and Jokolay running nicely together, and have Firefox, Discord, Obsidian and Spotify all running at the same time.
@illi Yep, I had it running under Ubuntu and now use it in EndeavourOS, both on SSD and with an Nvidia RTX GPU.
I have the ArenaNet (most game hours) and Steam versions. I installed it in Steam, which handles all the hard work, and added "-provider Portal" to the game's startup options in Steam which makes it use your ArenaNet account. (This is what RiQuY meant in their reply to your Lemmy post).
@lorty Good question. Have a look at the Version History section of https://wiki.guildwars2.com/wiki/Warclaw
A single visit to WvW will unlock it providing you own Janthir Wilds and either PoF or HoT.