Well, I should have never updated the driver. The black line came back. Hopefully I still have a backup.
Hello jaybo
If all else fails, and the scanner must be made to work...
We have used this at my place of work for around 15 years to keep a special scanner working on redmond operating systems.
Good luck 
I was able to restore the old driver successfully . Still don't understand why Ubuntu 18.04 decided to go with experimental drivers:
$ apt list --upgradable -a
Listing... Done
libsane-common/bionic-updates,bionic-updates 1.0.27-1~experimental3ubuntu2.1 all [upgradable from: 1.0.27-1~experimental3ubuntu2]
libsane-common/bionic,bionic,now 1.0.27-1~experimental3ubuntu2 all [installed,upgradable to: 1.0.27-1~experimental3ubuntu2.1]
libsane1/bionic-updates 1.0.27-1~experimental3ubuntu2.1 amd64 [upgradable from: 1.0.27-1~experimental3ubuntu2]
libsane1/bionic 1.0.27-1~experimental3ubuntu2 amd64
libsane1/now 1.0.27-1~experimental3ubuntu2 amd64 [installed,upgradable to: 1.0.27-1~experimental3ubuntu2.1]On my LiDE 120 it is still broken, even in 20.04, as it does not use the official SANE 1.0.29 release, which fixes this properly.
I don't understand, does your LiDE still get the big black line with 20.04. And does 20.04 still use experimental driver as does 18.04?
Not a black line but a discolored one, it is lighter than the rest of the page. And 20.04 is still at 1.0.27experimental, at least the daily build I tried yesterday.
See also https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1862926
Did you ever try the patch listed in https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1731459, specifically post #33 & #37? Not sure if it will work with 20.04.
No, I didn't - I went straight to a genesys backend built from the 1.0.29 sources . That did the trick.
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...and SANE 1.0.29 finally appeared in 20.04 
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