UI in ubuntu is almost not usable
1.File ->Start center->create new score
2. Enter the required data
3.Next->Choose Instruments->Percussion->Unpitched->drumset->next ->choose key signature->next->finish
4.Check the left end of the editor, they are not recognizable
5.Press n to input in staff
6. Check at the bottom of editor as in second screen shot, it is not usable at all.
PS: This issue is on Ubuntu