Sorry, the package name is 'printer-driver-all', with no 's'.
Assuming that you are using Trisquel, try installing the metapackage
printer-drivers-al, either in a terminal with
sudo apt install printer-drivers-all
or by searching for it in Synaptic Package Manager.
Hopefully the required driver is in there and your printer will start working.
If not,
I am using Linux for the first time. Anybody help me to connect my printer to
It. I am in the printing business and I have a lot of work pending.
Lexmark Printer Support
