Sure I'd love some help, found some time to play today and keep getting CTD, it's basically unplayable for me ):
I'm using a RX 580 GPU, ASUS 370x Pro-Prime Mobo, 3200x flash, G Skill 3200x Flare-X RAM 2 8gb sticks. I'm running Ubuntu MATE 18.04. Running up to date Steam and Mount and Blade, using Brytenwalda 1.41, the original version.
It crashes when changing scenes as said like leaving a city or entering a battle. It also crashes quite often when I press the "load" button. I'm not sure if it'll help, but I launched the game through the terminal, and I might have gotten an error message at the end, I'll copy/paste here just in case it's helpful:
:~$ steam
Running Steam on ubuntu 18.04 64-bit
STEAM_RUNTIME is enabled automatically
Pins up-to-date!
[2019-04-13 15:40:17] Startup - updater built Feb 18 2019 22:08:53
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[2019-04-13 15:40:18] Checking for update on startup
[2019-04-13 15:40:18] Checking for available updates...
[2019-04-13 15:40:18] Downloading manifest: client-download.steampowered.com/client/steam_client_ubuntu12
[2019-04-13 15:40:18] Download skipped: /client/steam_client_ubuntu12 version 1550534751, installed version 1550534751
[2019-04-13 15:40:18] Nothing to do
[2019-04-13 15:40:18] Verifying installation...
[2019-04-13 15:40:18] Performing checksum verification of executable files
[2019-04-13 15:40:19] Verification complete
crypto.cpp (2173) : Assertion Failed: rsaKey.IsValid()