GCC 9 and 10 seem to be installed

[Moltke]

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You can keep both, and make one the default, just type in a terminal

Code:

sudo update-alternatives --config gcc

You'll see something like

Code:

There are 3 choices for the alternative gcc (providing /usr/bin/gcc).

  Selection    Path            Priority   Status
------------------------------------------------------------
* 0            /usr/bin/gcc-8    90        auto mode
  1            /usr/bin/gcc-9    70        manual mode
  2            /usr/bin/gcc-10  80        manual mode
 
Press <enter> to keep the current choice[*], or type selection number:

Select the one you want to use and that's it.

Hope this helps!