On Ubuntu, make sure you have the packages
- liblapack-dev
- libopenblas-dev
installed:
sudo apt install liblapack-dev libopenblas-dev
After that, “-L/usr/lib -llapack -lblas” should work. Also note that, as already mentioned in another answer, in the output you showed, you have “-L/usr/share/doc/liblacpack -L/usr/share/doc/libblas”, which is certainly not what you want.