/usr/lib/x86_64-linux-gnu/libsolvext.so is in libsolvext0-dev 0.6.11-1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsolvext.so.0
/usr/lib/x86_64-linux-gnu/libsolvext.so.0