If a pattern starts. Then I would investigate /var logs.
But if just a one off error that happens rarely. Ignore it like beachboy2 says.
I have also seen error report messages myself when 1st using ubuntu and ignored them mainly because I was clueless as to the meaning of the message.Just like you.
Might try (I do not have nxclient installed)
Code:
$ dmesg grep | nxclient
This might launch nxclient
or maybe
Code:
$ dmesg | grep nxclient
Code:
$ apt search nxclient
Sorting... Done
Full Text Search... Done
libsphinxclient-0.0.1/trusty 2.0.4-1.1ubuntu2 i386
Fast standalone full-text SQL search engine - Client library
libsphinxclient-dev/trusty 2.0.4-1.1ubuntu2 i386
Fast standalone full-text SQL search engine - Client library
Just showing you how to look around. Not how to read or interpret error messages though.
You will have to use google search to interpret error messages.
Nxclient sounds like part of Freenx to me (which I do not do, I have ssh off)
https://www.howtoforge.com/tutorial/...4-trusty-tahr/