Comment 1 for bug 1996460

This issue was spotted and fixed in the beginning of this year after a python version update in some linux distributions.
The fix is incorporated in 0.5.3+ version of timekpr which is not yet packaged in debian and as a result not in ubuntu too.

Please install version from my PPA, latest at this point is 0.5.4 and this should fix it.

Pls report back whether it's all ok.