fix Font characters displayed as squares in Ubuntu

 

execute

rm -rf ~/.cache/fontconfig 
sudo fc-cache -r -v

enter your sudo password after executing this lines and  reboot

Setup ragner highlighting file

sudo apt install ranger highlight

to setup highlighting of file execute following 

 ranger --copy-config=scope

OSError: liblas_c.so.3: cannot open shared object file: No such file or directory

 sudo apt install -y liblas-c-dev