Is the scanner Canon Pixma MG2450 working in Ubuntu?

The drivers already mentioned in the question are just fine, only they cannot be used with the Simple San or Xsane tools, but they install a tool called ScanGear that can be launched with the command scangearmp.

Outputs: png, pdf, pnm.

To add a .desktop launcher for that:

sudo gedit /usr/share/applications/scan.desktop

and paste this:

[Desktop Entry]
Categories=Graphics;Scanning;
Exec=scangearmp
Icon=scanner
Name=Scan
Type=Application

The same can be used within Gimp: File/Create/ScanGear MP, but ScanGear does not need Gimp in order to work.

Sources are linked in my other answer.

I suggest adding the SANE daily build ppa to your system and updating. This gained functionality of a Canon multifunction printer/scanner on our system in xsane. Everything works except the document feeder, which I have posted a separate question about. If Canon provides scangearmp2 for your printer, does that work? It works on our system, including document feeder, but has a limited feature set compared to xsane.