The launcher opens displaying an error message no matter how many times it is launched.
If the file ~/.minecraft/webcache2/Default/Preferences is deleted, the next time the launcher starts.
If the launcher is closed without launching the game it will start again, if the game is launched the error will appear again until the file is deleted once more.
Environment
Operating System: TUXEDO OS
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.11.0-109019-tuxedo (64-bit)
Graphics Platform: X11
Processors: 16 × 11th Gen Intel® Core™ i7-11800H @ 2.30GHz
Memory: 31.1 GiB of RAM
Graphics Processor 1: Intel® UHD Graphics
Graphics Processor 2: NVIDIA GeForce RTX 3060 Laptop GPU
Manufacturer: TUXEDO
Product Name: TUXEDO Polaris Intel Gen3 (TGL)
This ticket duplicates MCL-24881