Comment 12 for bug 1294908

Installing 16.04.3 32-bit server in VirtualBox in Windows 7 worked for me but with 384 MB. The stated minimum of 256 had the install abort on the loading of apt-cdrom-setup. I increased memory to 320, which went a bit further but aborted on loading the installation partition manager ('didn't jot down its exact name). I then increased to 384 and the installation went through.