I have at least 9 pcs with the same problem.
Kubuntu 16.04 LTS
kactivitymanage[2793]: segfault at 7f7b0800ecd0 ip 00007f7afc029261 sp 00007fff7dd187e8 error 4 in libQt5Sql.so.5.5.1[7f7afc015000+3f000]
I have at least 9 pcs with the same problem.
Kubuntu 16.04 LTS
kactivitymanage [2793]: segfault at 7f7b0800ecd0 ip 00007f7afc029261 sp 00007fff7dd187e8 error 4 in libQt5Sql. so.5.5. 1[7f7afc015000+ 3f000]