verify_checksum: -5 (probably not tlcontrib this time)

[Karl Berry]

Hi Jack,

    > /Library/TeX/texbin/tlmgr: unexpected return value from
    verify_checksum: -5

Indeed, the gpg key for the main TL19 repository expired yesterday :(.
The TL20 release will have an updated key.

There have been no updates to TL19 for some weeks, and won't be any in
the future.  If you want/need to run tlmgr from TL19 anyway, e.g.,
because there are some older updates you didn't previously get, you can
tell it to skip verification with tlmgr --verify-repo=none.

Also, I believe Norbert reworked the verification code (in tlmgr 54118,
7mar20) so that it both gives a more comprehensible error message and
continues anyway in the case of an expired key, precisely for this case.

Hope this helps somehow,
Karl