I’ve managed to solve my problems after looking for some options. There is apparently no specific driver for Canon Pixma MG2550S, for linux (if someone has found it, please let me know!) However, there is a version available on the website of Canon for the model MG2550, that gives me the options that I needed regarding to printing quality and just works! The options presented in this driver are different from the way I used to have on Zorin 15.3, but it’s enough for my needs (if someone knows a newer version of this drive, please let me know).
Here is how you can download and install this - other version - of the driver MG2500:
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Download the 2 tar.gz files for “Linux (64 bits)”, one for printing and the other for scanning:
• MG2500 series IJ Printer Driver Ver. 4.00 for Linux (debian Packagearchive)
• MG2500 series ScanGear MP Ver. 2.20 for Linux (debian Packagearchive)
** You have to accept the Software license agreement to download them.
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Download the 2 manuals related to installation procedures:
• IJ Printer Driver Ver. 4.00 for Linux (Operation guide)
ScanGear MP Ver. 2.20 for Linux (Operation guide)
** You have to accept the Software license agreement to download them.
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Unpack the tar.gz files via “Terminal” (command line):
cd <directory-where-you-downloaded-the-files>
tar -zxvf cnijfilter-mg2500series-4.00-1-deb
tar -zxvf scangearmp-mg2500series-2.20-1-deb.tar.gz
tar -zxvf guide-pd-4.00-1_en.tar.gz
tar -zxvf guide-sd-2.20-1_en.tar.gz
or via the option “Extract Here” from the file manager “Files” (right-click on the name of the tar.gz file to see the option).
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Open the manuals in the browser, to follow as a guidance. The easiest way is do via the file manager:
Go to “/guide-pd-4.00-1_en” and double-click on the file “guide_index.htm”
In the same way, go to “/guide-sd-2.20-1_en” and double-click on the file “guide_index.htm”
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Install the printer driver via “Terminal”:
cd <directory-where-you-downloaded-the-files>/cnijfilter-mg2500series-4.00-1-deb
sudo ./install.sh
Follow the instructions on the screen. If you have doubts, check the related manual that you've opened via the browser: “Setup” >> “Installation”
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Install the scangear via “Terminal”:
cd <directory-where-you-downloaded-the-files>/scangearmp-mg2500series-2.20-1-deb
sudo ./install.sh
If you get an error just like me, saying:

then you have to first install the libusb-0.1-4 package and then install the scangear again:
sudo apt-get install libusb-0.1-4
sudo ./install.sh
In the same way, follow the instructions on the screen. If you have doubts, check the related manual that you've opened via the browser: “Setup” >> “Installation”
I have now a MG2500 driver that works and have more options than the one that came with Zorin 16.