In case anyone else gets an “unknown problem with altool” in SD Notary, and you don’t want to waste an hour restoring certificates and much more, the solution may be (as it was for me):
sudo xcode-select -r
which reinstalls the command-line tools.
And another solution (which may in fact accomplish the same thing) is to open Xcode, go to Preferences (in Ventura, Settings), then Locations, and simply click on whatever is in the “Command Line Tools” field.
I’ve been setting up a clean system after finding minor problems in a system that has probably been updated for more than ten years, and had a major headache getting SD Notary to work. This solved it.
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