Reply to thread

Message: <blockquote data-quote="Barman58" data-source="post: 551103" data-attributes="member: 133">For a multi-boot install you need to install the older Operation System onto it's own disk or partition, this installs the boot files along with the actual system files. You then install the second Operating system (which must be the same as or newer than the original), onto it's own disk or partition. The installer should recognise the original OS and offer to update this.  If you choose not to update the OS but to install a new copy the installer Will add the OS files to the partition or drive specified, and also Modify the original Boot files on the original partition to offer the dual boot. If you at a later time decide to remove the original Partition or drive then the later install will no longer work as it cannot find the boot files. In this instance you can run a boot repair from the OS install media to re-install the boot files to the correct partition or disk, This often needs to be run a number of times (three or more) to fully repair the issue</blockquote>