- Windows Fast Startup – Fast Boot is a BIOS option that has nothing to so with Windows – as @Teo suggests, Fast Boot (the BIOS option) is generally recommended to be disabled for Linux.
- The Microsoft implementation of Secure Boot is unsupported by Manjaro; it must be disabled.
Every OS must use the same technology to boot – either UEFI or Legacy/CSM – attempting to use both will not succeed. This also extends to partitioning schemes; if using UEFI then disks should use GPT partitioning; if using Legacy/CSM then disks should generally use msdos/mbr based partitioning.
Please, don’t do this.
Did you check the downloaded ISO for consistency against the provided checksum?
As a new forum user, please take some time to familiarise yourself with Forum requirements; in particular, the many ways to use the forum to your benefit:
The Update Announcements should be checked frequently for important update related information.
These announcements contain a Known Issues and Solutions section and should generally be checked before posting a request for support.
Please provide more useful system information:
Output of the following command formatted according to forum requirements (see links above) may be useful for those wishing to help:
inxi --admin --verbosity=8 --filter --no-host --width
Be prepared to provide more information and outputs from other commands when asked.
Regards.