CPack generated CMake DEB control file is malformed
In current master (1ba87fd1) the CPack DEB generator inserts the contents of the "Copyright.txt" file after the "Description:" field in the "control" file without following the formatting requirements for multiline content[1].
When trying to install such a DEB package installation fails since the raw multiline content of Copyright.txt is not parseable.
The commit that broke this is likely 332b089a. Before that "Description:" had a single line of content.
[1] https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Description