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In some Upgrade installations, you might be offered the option to relocate software when doing so is not necessary.
After calculating the free disk space on your computer to determine the suitability of your system for an Upgrade installation, you might see the message:
Your system can be upgraded, however your root filesystem does not have enough free space to hold all the new software.
This message would be followed by the ``Using non-root filesystems for Software Storage'' screen.
If this screen is displayed and the only filesystem option under ``Available filesystems'' is root, you can safely accept this choice and proceed with the installation. There will be enough disk space in the root filesystem to complete the install successfully.
After an Upgrade installation which relocated software to non-root filesystems, the following error message might appear before the prompt to enter System Maintenance Mode:
mount: /dev/root is already mounted, / is busy, or allowable number of mount points exceeded: Device busy
This message is spurious; the root filesystem is mounted and your system is usable.