No disc writing tool is present Ubuntu 18.04 [duplicate]

Solution 1:

brasero is a package in the "universe" repository:

walt@bat:~(0)$ apt policy brasero
brasero:
  Installed: (none)
  Candidate: 3.12.1-1ubuntu3~16.04
  Version table:
     3.12.1-1ubuntu3~16.04 500
        500 http://ca.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
     3.12.1-1ubuntu2 500
        500 http://ca.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages

so, a simple sudo apt install brasero will install it.