Canon scanner not detected in Ubuntu 20.04 desktop

Question

I have configured a new install of Ubuntu 20.04 desktop. I installed the printer and scanner drivers following the instructions at https://ubuntuhandbook.org/index.php/2020/05/canon-printer-scangear-mp-ubuntu-20-04/ and that installed the Scangear icon in my Applications menu. I have a Canon PIXMA MG2522 (2500 series) printer-scanner all-in-one. I also installed cups-backend-bjnp per the answer at Fresh Install of 20.04: Canon Pixma MG2522 Cant Print from GUI or Terminal.

The printer works, but the scanner does not. When I open the Scangear icon it says “No Scanners Detected” and gives me the option to search for scanners – it searches for awhile and then says it can’t find any scanners. My scanner is on and connected to the laptop.

The article referenced starts with: sudo add-apt-repository ppa:thierry-f/fork-michael-gruz. When I installed it I got these messages:

Err:15 http://ppa.launchpad.net/michael-gruz/canon/ubuntu focal Release        
  404  Not Found [IP: 91.189.95.85 80]
Reading package lists... Done                                                  
E: The repository 'http://ppa.launchpad.net/michael-gruz/canon/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Finally, I went into Synaptic Package Manager and reloaded package information, and I got this message: “The repository 'http://ppa.launchpad.net/michael-gruz/canon/ubuntu focal Release' does not have a Release file.”

I just migrated from Windows to Ubuntu desktop. The scanner works on Windows because Canon distributes Windows software, but I need this to work with Ubuntu. I can print but I can’t scan. When I go into Settings – Printers the Canon printer is listed.

Thanks for any help.

Per request from brian_p, here is the output from lsusb -v | grep -A 3 bInterfaceClass.*7

Couldn't open device, some information will be missing

can't get debug descriptor: Resource temporarily unavailable

Couldn't open device, some information will be missing

  bInterfaceClass         7 Printer
bInterfaceSubClass      1 Printer
bInterfaceProtocol      2 Bidirectional
iInterface              0

Couldn't open device, some information will be missing

Canon scanner not detected in Ubuntu 20.04 desktop

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