How to replicate:
1. Start the Launcher (version 2.3.136)
2. Go to "Mincraft: Java Edition>Installations"
3. Click the three dots of one entry
4. Click on "Edit"
5. Click on the "Browse" Button next to the Game Directory option
6. The Launcher will Crash
My son has this same issue and it seems there is a segfault in libpthread when the browse button is pushed
here is from dmesg
[ 60.116599] minecraft-launc[2848]: segfault at 10 ip 00007f4691993fc4 sp 00007ffe03379f18 error 4 in libpthread-2.31.so[7f469198f000+11000]
[ 60.116609] Code: 7e 8f 45 31 d2 ba 01 00 00 00 be 01 00 00 00 48 89 ef b8 ca 00 00 00 0f 05 e9 73 ff ff ff e8 13 b7 ff ff 0f 1f 00 f3 0f 1e fa <8b> 47 10 89 c2 81 e2 7f 01 00 00 90 83 e0 7c 75 7b 53 48 83 ec 10