Launching ROOT problem

hi !
I get error massage when launching ROOT;

root
ERROR in cling::CIFactory::createCI(): cannot extract standard library include paths!
Invoking:
  LC_ALL=C x86_64-linux-gnu-g++-9  -O3 -DNDEBUG -xc++ -E -v /dev/null 2>&1 | sed -n -e '/^.include/,${' -e '/^ \/.*++/p' -e '}'
Results was:
With exit code 0
   ------------------------------------------------------------------
  | Welcome to ROOT 6.22/08                        https://root.cern |
  | (c) 1995-2020, The ROOT Team; conception: R. Brun, F. Rademakers |
  | Built for linuxx8664gcc on Mar 10 2021, 14:20:04                 |
  | From tags/v6-22-08@v6-22-08                                      |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'       |
   ------------------------------------------------------------------

root [0] 

How can i fix that ?

“I use ubuntu 20.10”

It seems that you try to use a binary distribution built for Ubuntu 20.04 (gcc 9.3) on Ubuntu 20.10 (gcc 10.2). I’m afraid you will need to build ROOT from source.