Update INSTALL_UBUNTU.md

2 jobs for master
Status Name Job ID Coverage
  Test
failed job1 #743

00:00:41

failed job1 #125

 
Name Stage Failure
failed
job1 Test
or you are unsure what this means choose another name with the '--name' option.

$ ./install.sh all

Install all current projects
============================

cat: .gitmodules: No such file or directory
ERROR: Job failed: exit code 1