Hi
You might consider upgrading, KiCad has Ubuntu PPA with newest versions.
I used procedure as standard Ubuntu repository does not have latest version.
Have found designing symbol in my case start with pins on 50mil and then switching to various grids for design features and then switch back to 50mil and save symbol. If using 10 mil the same would follow and switch to 10mil and save.
https://forum.kicad.info/t/new-ubuntu-ppa-home-announcement/23965