I too have found that my ageing Canoscan works with the latest Ubuntu-based distros but only on kit that uses BIOS rather than UEFI. Even if the UEFI is in Legacy mode the OS seems unable to see the device in a functional way even when it can identify it in a lsusb command.
It would be good to know whether other people can corroborate this and if so might explain some of the problems others are reporting in this thread.
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