sudo apt-get install breeze-icon-themeで解決

Missing button icons in EKOS under Ubuntu 15.10

https://indilib.org/forum/ekos/988-missing-button-icons-in-ekos-under-ubuntu-15-10/50577.html

Kstars Integration issue with Gnome desktop

https://indilib.org/forum/ekos/3679-kstars-integration-issue-with-gnome-desktop.html