I recently updated to Ubuntu 20.04 (linux 5.4.0-31-generic) on three separate machines (One Ubuntu Mate, two Lubuntu) and my two Kobo ereaders are not recognised as devices. They are not even seen as drives when I do "lsusb". The reader itself "connects" to my PC, and is charging OK but Ubuntu does not seem to see it.
Since there is nothing for me to latch onto I am at a loss as to what to do. Any help would be appreciated.
Thanks, Neil
sudo udevadm monitor -u
andjournalctl --follow
. Had you tried different USB cables? BTW, short ones are preferred.