Solus does not appear in the startup menu
Cause
After a software update, Solus might disappear from the startup menu. This situation commonly occurs on systems using a legacy startup method (non-UEFI systems) where another Linux distribution owns the startup manager (such as GRUB).
Procedure
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To restore access to Solus, access the other operating system and update the startup manager.
For more information, check the documentation of your distribution.