To downgrade, first you need to download the deb file, in this case from: http://archive.ubuntu.com/ubuntu/pool/main/s/sane-backends/
Download at any directory the file libsane_1.0.18-3ubuntu1_i386.deb
Then, in a terminal, move to the directory where the file has been downloaded and execute:
sudo dpkg -i --force-downgrade libsane_1.0.18-3ubuntu1_i386.deb
Good luck.
To downgrade, first you need to download the deb file, in this case from: archive. ubuntu. com/ubuntu/ pool/main/ s/sane- backends/ 1.0.18- 3ubuntu1_ i386.deb 1.0.18- 3ubuntu1_ i386.deb
http://
Download at any directory the file libsane_
Then, in a terminal, move to the directory where the file has been downloaded and execute:
sudo dpkg -i --force-downgrade libsane_
Good luck.