Ubuntu 22.04 cannot scan with Canon Pixma

I have a Canon Pixma printer/scanner; upon first USB connection to my Ubuntu 22.04 laptop, I did not need to do anything special to print.

However, when I tried to scan, xsane says "no devices available"; and:

$ scanimage -LNo scanners were identified. If you were expecting something different,check that the scanner is plugged in, turned on and detected by thesane-find-scanner tool (if appropriate). Please read the documentationwhich came with this software (README, FAQ, manpages).

And simple-scan (Document Scanner) writes: "Additional Software Needed" "You need to install driver software for your scanner", where "install driver software" notes: "You appear to have a Canon scanner, which is supported by the Pixma SANE backend. Please check if your scanner is supported by SANE ..."

However, I do have:

$ ls -la /usr/lib/x86_64-linux-gnu/sane/libsane-pixma.so.1.1.1-rw-r--r-- 1 root root 256344 Mar 27  2022 /usr/lib/x86_64-linux-gnu/sane/libsane-pixma.so.1.1.1

What could be the problem here?