If you are running a distribution other than the ones we have mentioned, try the experimental portable AppImage (also see Issue #333 on our GitHub).
Celestia 1.6 AppImage:
wget -O celestia-1.6-x86_64.AppImage https://download.opensuse.org/repositories/home:/munix9:/celestia:/1.6/AppImage/celestia-latest-x86_64.AppImage
chmod 755 celestia-1.6-x86_64.AppImage
Optionally create a portable, main version-independent $HOME directory in the same folder as the AppImage file:
mkdir celestia-1.6.home
Celestia 1.7 AppImage:
wget -O celestia-1.7-x86_64.AppImage https://download.opensuse.org/repositories/home:/munix9:/celestia:/1.7/AppImage/celestia-latest-x86_64.AppImage
chmod 755 celestia-1.7-x86_64.AppImage
Optionally create a portable, main version-independent $HOME directory in the same folder as the AppImage file:
mkdir celestia-1.7.home