Most OS require that as you install them you select how / where you install.
If you selected the same directory as your first installation then you will not be given an OS boot option.
For dual OS it is normal to select a second drive as the location.
If you had two OS before and they were working fine then you may have corrupted the boot loader in some way.
Knowing which two OS's you have may have been useful as Linux brings new challenges to the table.
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