 @RikMills @mitya57 btw this is apparmor-related:
 
 ```
 2023-12-19T20:07:38.091817+00:00 lubuntu kernel: [  170.840872] audit: type=1400 audit(1703016458.083:45): apparmor="DENIED" operation="userns_create" class="namespace" info="User namespace creation restricted" error=-13 profile="unconfined" pid=2409 comm="qutebrowser" requested="userns_create" denied="userns_create"
 2023-12-19T20:07:38.091818+00:00 lubuntu kernel: [  170.840934] traps: qutebrowser[2409] trap int3 ip:7f05a3c4cb13 sp:7ffed669c4d0 error:0 in libQt5WebEngineCore.so.5.15.15[7f05a1a29000+6931000]```