I’ve had two Brother laser printers now, in both cases drivers were packaged as either .deb or .rpm.
I’m currently running a Brother HL-L2395DW mono multifunction laser printer under KDE Neon, and both the scanner and printer work perfectly over the network.
May I recommend KDE Neon. Canonical have ruined vanilla Ubuntu with their Snaps agenda.
Microsoft have Microsoft accounts, Canonical have Snaps…