*** This bug is a duplicate of bug 1947723 ***
https://bugs.launchpad.net/bugs/1947723
** This bug has been marked a duplicate of bug 1947723
/dev/ttyUSB? port lost on upgrading to 21.10
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Sorry, turns out this is most likely a duplicate of
https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1947723 and
the messages from the pi-bluetooth package are unrelated.
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> /usr/lib/udev/rules.d/90-pi-bluetooth.rules:14 Invalid value ...
rules provided by pi-bluetooth package, not systemd.
** Package changed: systemd (Ubuntu) => pi-bluetooth (Ubuntu)
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just to clarify, before the upgrade I had /dev/ttyACM0 and a
corresponding entry in /dev/serial/by-id/ for it.
I've verified that a fresh image of 20.04 LTS with the same device
attached does not exhibit the same issue, and the device shows up as
expected.
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