[Bug] mantos-monitor not working on Ubuntu 18.04

[Kostas Katsaros]

Hi! Thank you for your work!

On Ubuntu Server 18.04.1 x64 I installed Mandos server (from Ubuntu repositories, this is 1.7.19) and added a couple of clients. It's a fresh and minimum installation, only ssh running inside.
Everything runs ok (mandos-ctl is working as expected), except the mandos-monitor utility. This fails, giving the following:
########################################
Traceback (most recent call last):
File "/usr/sbin/mandos-monitor", line 738, in <module>
ui = UserInterface()
File "/usr/sbin/mandos-monitor", line 463, in __init__
"Mandos Monitor version " + version))
File "/usr/sbin/mandos-monitor", line 507, in log_message_raw
coming_from="above")
File "/usr/lib/python2.7/dist-packages/urwid/listbox.py", line 578, in set_focus
raise IndexError("Can't set focus, ListBox is empty")
IndexError: Can't set focus, ListBox is empty
########################################
The indentation of the message is strange. Furthermore, the bash starts a strange behaviour after that until exiting.

Is there a hint on this?

Thanks in advance,
-- 
Kostas Katsaros
https://www.fossoffice.com/
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