I already installed the Uhbik's to my system via ./install.sh and just the Bitwig trial recognizes them.
LV2 are automatically added in Ardour3. So should LinuxVST?
" Linux VST (LXVST) plugins are distributed as shared library files. They are typically installed in /usr/lib/lxvst, /usr/local/lib/lxvst or a directory mentioned in your LXVST_PATH environment variable."
So you will need to point where the vst's are installed.
if you open a terminal you can add the environment variable like this.
($ is promptsign)
$ export LXVST_PATH=/usr/lib/vst:/usr/lib/lxvst:$HOME/.vst:$HOME/vst/
In this case ardour would search in /usr/lib/vst, /usr/lib/lxvst for linux vst's but also in your home subdirectories .vst (if there is a point before the name then it's a hidden file of directory) and vst/
Now the environment variable would be lost if you would reboot you system, or logout also(not sure) so you need to store the export command in a file.
I store it in ~/.bashrc zo everytime i log in, the variable is set.