The information in the bug is clear. However, it is unlikely that this bug will be resolved for 16.04. This is a function of the ISO detection that has been in place in Ubuntu since its inception; the nature of the image build process means there is no 100% reliable way to determine which CD is the "right" one, so the heuristics used can fail in the manner you describe if more than one Ubuntu CD is present on the system at install time.
I think the obvious workaround, which seems to have sufficed for everyone up to now, is to not leave multiple CDs in the system when installing. So I do not agree with the proposed "critical" severity. ** Changed in: debian-installer (Ubuntu) Importance: Undecided => Low ** Changed in: debian-installer (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1551078 Title: CDROM installation fails for ubuntu 14.04.3 if another CDROM of ubuntu version is attached to same system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1551078/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs