I used to use the following commands to install libgeos and basemap in google colaboratory and it worked perfectly until last week.
!apt-get -qq install libg
It seems to have something to do with the latest pyproj release (2.0.1), which was released on 10.03.2019. Try installing older version of pyproj, eg. pip install pyproj==1.9.6
pip install pyproj==1.9.6