As workaround in my case I found that I can mount USB flash drive partition as /cdrom and setup will continue:
1. When installer report "Try mounting the CD-ROM?" select "<No>", then "<Continue>". 2. Then in "[?] Ubuntu installer main menu" select "Execute shell", then "<Continue>". 3. Mount flash drive partition as /cdrom, in my case it was /dev/sda1: mount /dev/sda1 /cdrom 4. Exit shell by entering exit 5. Select "Detect and mount CD-ROM" in appeared "[?] Ubuntu installer main menu" --- installation will continue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/778319 Title: Installation via USB-stick impossible To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/778319/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
