Can't switch update channel

RandomUser

I'm running 20.04, not sure which OTA. When going to the update screen in the system settings, the update channel is stuck at 16.04. Changing it ends up in an infinite spinner.

There might be a problem reading the current OS information perhaps?

I'm not able to see anywhere which OTA it is, the "About" page has an empty field
Running the "Ubuntu Info" app fails to list lots of device information
Running system-image-cli i returns this error:

Traceback (most recent call last):
  File "/usr/bin/system-image-cli", line 6, in <module>
    from pkg_resources import load_entry_point
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 844, in exec_module
  File "<frozen importlib._bootstrap_external>", line 976, in get_code
  File "<frozen importlib._bootstrap_external>", line 640, in _compile_bytecode
EOFError: marshal data too short

Any ideas to fix this or which direction to look?