I can confirm. The executable is compiled against the so.20, while versions seem to be actual dates. doma@astropi:~$ ldd /usr/bin/indi_qhy_ccd |grep qhy libqhyccd.so.20 => /lib/aarch64-linux-gnu/libqhyccd.so.20 (0x0000ffffba0d2000) A closer look reveals a work in progress, there is already a - broken - symlink for the oncoming so.21 series in the package: doma@astropi:~$ ls -l /lib/aarch64-linux-gnu/libqhyccd* lrwxrwxrwx 1 root root 15 Feb 16 03:12 /lib/aarch64-linux-gnu/libqhyccd.so -> libqhyccd.so.21 lrwxrwxrwx 1 root root 20 Feb 16 03:12 /lib/aarch64-linux-gnu/libqhyccd.so.20 -> libqhyccd.so.20.2.11 -rw-r--r-- 1 root root 2939936 Feb 16 03:12 /lib/aarch64-linux-gnu/libqhyccd.so.20.2.11Read More...