Hi!! I've found it on the web [1]. The package ippusbxd needs to be removed, then it works.
"For Ubuntu 20.04, this scanner does not work straight forward. The ippusbxd driver tries to get the USB device, and it locks it." $ LANG=C apt show ippusbxd ... Description: Daemon for IPP USB printer support ippusbxd is a userland driver for USB devices supporting the IPP USB specification. It enables these USB printers to be seen as regular network IPP printers. Bye, Volker [1] https://askubuntu.com/quest ions/1107632/install-canon-lide-300-400-on-ubuntu-18-04
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