I'm not able to get the information to troubleshoot and will sign off.
There may be others that can help you.

Please list each operating system installed in this fashion:
Windows 7
Windows 8
Windows 8.1
Windows 10
Windows 11
Linux


Then indicate which one is bootable and which one is not bootable.

The srttrail.txt were from 2020.

On the disk drive which operating systems are installed?
Linux, windows 10, windows 7?
Which one can boot and which one fails to boot?

When can you test the...

See if you can find and post a share link for: system32\logfiles\srt\srttrail.txt

I'm not familiar with Linux.

If you have Windows 7 instead of Windows 10 there are additional options for...

If important files still need to be backed up steps can be provided that may work.

If important files are already backed up then you can clean install (may be substantially faster than...

This is a Windows 10 forum.
There are few members that comment on Linux /Ubuntu.
So you may be better off seeking help in a Linux forum.

Were you dual booting Windows 10 and Linux?
or Windows 7...

The earlier post was for the above quotes

Each time the computer is rebooted you can perform these steps to find the applicable drive letter:

1) select any drive letter followed by the dir command
2) bcdedit
3) bcdedit /enum
4)...