I had my system recently updated to ubuntu 18.04 from 14.04 (with root 6.06). Since root needed to be reinstalled I decided to pass to the most recent version. I made the installation according to the instructions, using cmake. I didn’t notice any warning or error during the compilation.
Starting root, the logo picture does not appear (not sure if this isn’t part of the new version), my old scripts run and compile without problem, but no graphics appear and I recieve a lot of warning or error messages about everything that to do with Draw or Fit.
Trying a simple thing, just opening a TCanvas, I get the following message:
root  new TCanvas("c1","cccccc") Warning in <TCanvas::ResizePad>: c1 width changed from 0 to 10 Warning in <TCanvas::ResizePad>: c1 height changed from 0 to 10 (TCanvas *) 0x561d671fe9a0
No canvas opens! Similarly, trying new TBrowser, nothing comes out.
I have checked similar reports in the forum, but none seems to fit with my case.
I have also tried to use the pre-built version [root_v6.20.02.Linux-ubuntu18-x86_64-gcc7.5.tar.gz] and I got exactly the same idea.
Any suggestion please?
Thank you very much in advance!
ROOT Version: 6.20/02
Platform: Ubuntu 18.04
Compiler: gcc 7.5.0
clang version: 5.0.0