Now you’ve caused the same problem again in reverse. libopenconnect-dev needs to conflict libopenconnect1 (< 3.15-0ubuntu2).
Unpacking replacement libopenconnect-dev ...
dpkg: error processing /var/cache/apt/archives/libopenconnect-dev_3.15-0ubuntu2_amd64.deb (--unpack):
trying to overwrite '/usr/lib/libopenconnect.a', which is also in package libopenconnect1 3.15-0ubuntu1
Now you’ve caused the same problem again in reverse. libopenconnect-dev needs to conflict libopenconnect1 (< 3.15-0ubuntu2).
Unpacking replacement libopenconnect-dev ... apt/archives/ libopenconnect- dev_3.15- 0ubuntu2_ amd64.deb (--unpack): libopenconnect. a', which is also in package libopenconnect1 3.15-0ubuntu1
dpkg: error processing /var/cache/
trying to overwrite '/usr/lib/
(Reported as bug 977522.)