Update to Ubuntu 20.04.

[BillyONeal]

Resolves #13624

[Neumann-A]

Could you add nodejs to the APT_PACKAGES. node is required to build qtwebengine in Qt 6.2.

[BillyONeal]

Could you add nodejs to the APT_PACKAGES. node is required to build qtwebengine in Qt 6.2.

Done

[JackBoosY]

Also please add libgtk-3-dev since #17111 need it.

[BillyONeal]

Also please add libgtk-3-dev since #17111 need it.

If this one builds without errors I'll merge it, if not I'll immediately start another one adding that.

[BillyONeal]

Also please add libgtk-3-dev since #17111 need it.

If this one builds without errors I'll merge it, if not I'll immediately start another one adding that.

I mean: If this one builds OK, I'll merge this one, and start a new one right after adding that for you. If this one doesn't build OK, I'll add it here.

[BillyONeal]

Also please add libgtk-3-dev since #17111 need it.

I'm not sure I should do that; it seems to be dragging in a bunch of libraries that are also in vcpkg and thus are likely to create ABI conflicts?

[dg0yt]

Also please add libgtk-3-dev since #17111 need it.

@ras0219-msft wrote that "100% we should not be using gtk3 from the system."

... it seems to be dragging in a bunch of libraries that are also in vcpkg and thus are likely to create ABI conflicts?

I proposed to add gtk-3, based on the last gtk port version that was based on gtk-3.
It might be enough to use it for wxwidgets/linux only.

[ras0219-msft]

If a package depends on gtk 3, it is incompatible with the current vcpkg CI, same as if a package wants boringssl or libressl.

If we see enough need for gtk3, we can investigate other options like a separate CI pass that builds gtk3 & consumers. Otherwise, I don't see a better option than manual testing with big scary warnings.

[dg0yt]

@ras0219-msft gtk3 is needed for wxwidgets on linux. Does gtk3 really conflict with gtk4 (like the ssl packages do)?

[Neumann-A]

Does gtk3 really conflict with gtk4 (like the ssl packages do)?

according to the file list on linux/windows it looks like both versions could coexist in the same registry just like qt5 and qt6.