Package: libell-dev Version: 0.4-1 Severity: serious Your package is lacking a dependency on libell0 (= ${binary:Version}), without it dynamic linking is not going to work:
,---- | $ sudo aptitude install libell-dev | [...] | $ file /usr/lib/i386-linux-gnu/libell.so | /usr/lib/i386-linux-gnu/libell.so: broken symbolic link to libell.so.0.0.1 `---- -- System Information: Debian Release: buster/sid APT prefers unstable APT policy: (500, 'unstable'), (101, 'experimental') Architecture: i386 (x86_64) Foreign Architectures: amd64 Kernel: Linux 4.17.0-nouveau (SMP w/2 CPU cores) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=de_DE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) -- no debconf information