The update to 15.10 has solved the problem here.
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https://bugs.launchpad.net/bugs/1455323
Title:
Regression in KDE5 desktop session save / restore
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Public bug reported:
When the title, first sentence, of the note contains the character « _
», this one doesn't appear in tray menu.
This_is_a_sample becomes Thisisasample.
expected:
This_is_a_sample
$ lsb_release -rd
Description:Ubuntu 15.04
Release:15.04
$ aptitude show tomboy