DirectAdmin don’t work after Ubuntu upgrade

Using Ubuntu and DirectAdmin, I made a dist-upgrade, upgrading linux-headers-server linux-image-server linux-server

After that I can’t use DirectAdmin. No error messages in browser. Just blank page.

cd to directadmin it looks like this:

root@server:/usr/local/directadmin# ./directadmin p
./directadmin: error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory

Whats going wrong here?

Many thanks!