So I haven't used this printer for a while because I can't get it to work on Linux. I followed the instructions:
https://itectec.com/ubuntu/ubuntu-how-to-install-canon-lbp2900b-printer-in-ubuntu-16-04-lts/
But I still don't know how to make it work. 
System Info:
CPU: Dual Core Intel Core i5-2467M
(-MT MCP-) speed/min/max:1043/800/2300 MHz
Kernel: 5.11.0-27-generic x86_64 Up: 6h 04m
Mem: 2427.5/3784.5 MiB (64.1%)
Storage: 316.73 GiB (5.6% used)
Procs: 241
Shell: bash 5.0.17 inxi: 3.0.38
Printer Info:
Printer Name: Canon LBP2900
Manufacturer: Canon
Connection: USB
Consumables: Toner Cartridge(* Canon genuine parts, and for A4 or Letter size paper at 5% page coverage using the factory default print density setting)
Printing software: CAPT (Canon Advanced Printing Technology)
Hope you can help me 