Error in v1.2.1 on Ubuntu 22.04 LTS: AttributeError: module 'collections' has no attribute 'MutableSet'

[jdrch]

I'm getting the above error on this machine. Full error text:

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'

Any ideas?

[gsker]

If you are not able to upgrade to a current version for some reason, you could try this workaround:
#1245 (comment)

In common/tools.py change line 1805 (or thereabouts) from
class OrderedSet(collections.MutableSet):
to
class OrderedSet(collections.abc.MutableSet):

[gsker]

Duplicate of #1245