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I've got a system with libgtk-3-0 version 3.22.30-1ubuntu1 installed. To fix a known bug I want to downgrade to version 3.22.21. However, running aptitude to find the available versions yells the following:

$ aptitude versions libgtk-3-0
package libgtk-3-0:
p  3.22.30-1ubuntu1                     bionic
i  3.22.30-1ubuntu2                     bionic-updates

so of course trying to install the version that I want didn't work

$ sudo apt install libgtk-3-0=3.22.21-1ubuntu1
E: Version "3.22.21-1ubuntu1" for "libgtk-3-0" not found
  • You could try adding an older repository. Then using Synaptic it is possible to force and lock an older version of Gtk. Warning! use at your own risk. – theGtknerd Apr 12 '19 at 1:54
  • @theGtknerd what are the risks? Couldn't adding an older repository cause some trouble on other packages? – Mauro F. Apr 12 '19 at 19:14
  • Yep, you're right. Commonly called dependency hell. I have used older repositories in some cases, and gotten them to work, but your milage may vary. – theGtknerd Apr 13 '19 at 1:13

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