[Taler] Ubuntu 22.04

[Thien-Thi Nguyen]

GNU Taler now requires PostgreSQL 13, which is not available
OOTB for Ubuntu 20.04 (the version we recommend).  I've added a
Mantis issue on it:

- https://bugs.gnunet.org/view.php?id=7261

This message is to ask people to look at that issue and comment
on it.  In particular, i'm wondering if maybe it wouldn't be
better (easier, more in line w/ "typical" user situation) to
bump our recommendation from 20.04 to 22.04.  What do you think?

(Personally, i only run Ubuntu 20.04 Server LTS in a VM so i
don't have a day-to-day feel about it.)

Thanks in advance!

-- 
Thien-Thi Nguyen

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