Hi,

> I hoped that

> sudo add-apt-repository ppa:gnome3-team/gnome3-staging
> sudo add-apt-repository ppa:gnome3-team/gnome3

Maybe you just shouldn't use a ~ 7.5 years old release?

Even the various "current" LTSes contain 3.22:

https://packages.ubuntu.com/search?keywords=libgtk-3-0


Regards,


Rene

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