There are gutenprint drivers available for the MG5700 series which should already be included in your distro, and many of the Canon models are supported by the 'sane-pixma' driver for scanning (included as part of sane-backends). So, a good idea to if these work for you first.
In addition to the above, Canon has
Linux drivers available for the MG5700 series. The scanner driver supplied by the scangearmp2-3.20-1-dev.tar.gz package is a little different as it is not a SANE backend as such, but instead comes with it's own scangearmp scanning utility. Use the proprietary packages only if the open source drivers don't work for you.
