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I was using g++ v11 and got a compiler error (" *internal compiler error: in expand... ") which as far as I read was introduced in version 8 of g++.

So I tried to downgrade to g++ v7 just to end with my assignment (university stuff) but since I'm on Ubuntu 22.04, I couldn't in any possible way because it won't let me download any obsolete package (deleting g++ doesn't sound like a solution).

The message after trying to install g++7 is

Package g++-7 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source.

Do you know how can I downgrade to g++-7?

Thank you all for your help and if you know other solutions it would be appreciated.

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