after upgrading the ubuntu system my printer doesn't work

On 29 August, I was offered an upgrade to the Ubuntu operating system. Everything I do on the computer is now slower which is bad enough. My printer got worse and worse and now won't print anything. It might sound as though it's printing very slowly, but the paper will be blank, and usually after the first attempt it won't do anything at all, though the screen might tell me it was printing. At first, it used to do some things but not others, but now it doesn't seem to want to print anything. It's a Canon Pixma 750 and I've just had it overhauled and been assured it's working fine. I can't seem to find the title of the upgrade so I can't even uninstall it.