Can't launch Brave and no message-box

$ brave-browser
[17354:17354:0414/101018.262585:ERROR:process_singleton_posix.cc(358)] <Japanese Error Message>
[17354:17354:0414/101018.262788:ERROR:message_box_dialog.cc(191)] Unable to show message box: <Japanese Error Message>

Probrem #1:
When I start it in GUI, no message box appears.

Probrem #2:
The message says “Unlock profile and restart Brave…” but I don’t know how to do that.

$ rm ~/.config/BraveSoftware/Brave-Browser/SingletonLock

Output is from process_singleton_posix.cc, I was able to delete the above file and start the program, but I think it would be easier to recover if the specific file name was displayed.

Brave version:
brave-browser/stable,now 1.77.97 amd64

OS:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=24.10
DISTRIB_CODENAME=oracular
DISTRIB_DESCRIPTION=“Ubuntu 24.10”

Regards.