Trac: fixing ‘Warning: Can’t synchronize with repository “(default)” (Unsupported version control system “svn”: No module named svn).’

If you get a message ‘Warning: Can’t synchronize with repository “(default)” (Unsupported version control system “svn”: No module named svn). Look in the Trac log for more information’ while setting up or migrating you Trac, it means that you don’t have SVN library for Python installed. Note that Trac uses subversion-python package and not pysvn….
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