Comment 6 for bug 1976164

If it may be helpful: Previously, I executed `backintime` and it showed:
    Traceback (most recent call last):
        File "/usr/share/backintime/common/backintime.py", line 27, in <module>
            import config
        File "/usr/share/backintime/common/config.py", line 32, in <module>
            import tools
        File "/usr/share/backintime/common/tools.py", line 1802, in <module>
            class OrderedSet(collections.MutableSet):
    AttributeError: module 'collections' has no attribute 'MutableSet'

I executed
    $ dpkg -l | grep backi
    ii backintime-common 1.2.1-3 all simple backup/snapshot system (common files)
    ii backintime-qt 1.2.1-3 all simple backup/snapshot system (graphical interface)

I went to https://launchpad.net/ubuntu/jammy/amd64/backintime-common/1.2.1-3ubuntu0.1 , downloaded http://launchpadlibrarian.net/606412102/backintime-common_1.2.1-3ubuntu0.1_all.deb and executed:
    sudo apt install ./backintime-common_1.2.1-3ubuntu0.1_all.deb

I went to https://launchpad.net/ubuntu/jammy/amd64/backintime-qt/1.2.1-3ubuntu0.1, , downloaded http://launchpadlibrarian.net/606412105/backintime-qt_1.2.1-3ubuntu0.1_all.deb and executed:
    sudo apt install ./backintime-qt_1.2.1-3ubuntu0.1_all.deb

I executed:
    $ dpkg -l | grep backi
    ii backintime-common 1.2.1-3ubuntu0.1 all simple backup/snapshot system (common files)
    ii backintime-qt 1.2.1-3ubuntu0.1 all simple backup/snapshot system (graphical interface)

I executed `backintime` and everything seemed to work correctly.