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"This protocol is not supported before version 1903"

Between yesterday and today, My kernel shut down (probably over memory). However, when I restart Sage, I get the following error in the terminal:

/usr/bin/www-browser: line 216: /mnt/c/Windows/System32/reg.exe: Input/output error
/usr/bin/www-browser: line 300: [: -ge: unary operator expected
This protocol is not supported before version 1903

The kernel does not start, Jupyter doesn't open, and open files can't actually be used. I'm a bit kerflummoxed because nothing changed. Does anyone have a clue what could be happening here? The error doesn't indicate version 1903 of what.

Windows 10 running: Ubuntu 22.04.1 Sagemath 9.5 Python 3.10.6