Package: libgsl2 Version: 2.4+dfsg-1 Severity: important libgsl2 2.3+dfsg-1 contains /usr/lib/i386-linux-gnu/libgsl.so.19 (on i386) libgsl2 2.4+dfsg-1 contains /usr/lib/i386-linux-gnu/libgsl.so.23 this breaks packages depending on libgsl2.
If the soname changed, package name must change too. -- MichaĆ Politowski