ubuntu 18.10 broken for a lot of packages? This time libdouble-conversion?

While trying to install my usual environment on Ubuntu 18.10 I have run into many, many problems.

I am curious why packages that are supposedly working under 18 seem to have all these issues?

I managed to build emacs from source, so my problems with emacs-gtk/emacs-common/emacs26 can all be put on the back burner.

But clementine and simplescreenrecorder both install using apt install and both, when run complain about

error while loading shared libraries: libdouble-conversion.so.1: cannot open shared object file: No such file or directory

Reading package lists... Done
Building dependency tree       
Reading state information... Done
libdouble-conversion-dev is already the newest version (2.0.1-5).
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.

From what I can see, there is a symbolic link:

lrwxrwxrwx 1 root root     25 Apr 10  2018 /usr/lib/x86_64-linux-gnu/libdouble-conversion.so -> libdouble-conversion.so.1

to a nonexistent file libdouble-conversion.so.1

apt-cache policy libdouble-conversion1
libdouble-conversion1:
  Installed: 2.0.1-5
  Candidate: 2.0.1-5
  Version table:
 *** 2.0.1-5 500
        500 http://us.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

I also built libdouble-conversion manually, but it creates /usr/local/lib/libdouble-conversion.so.3 and clementine, simplescreenrecorder, and octave are all expecting .so.1

I deleted libdouble-conversion is /usr/local/lib and tried:

sudo apt install --reinstall libdouble-conversion1

now octave, simplescreenrecorder and clementine all coredump. Is there any way to identify what is happening? To show which shared library is failing? I would like to show that it is in fact, still libdouble-conversion.

I would of course like to solve this problem, but I would also appreciate if anyone could explain why there are so many problems like this with 18.10?