Dual booting

After installation at dual boot asking for id and password which they do not work on my Dell XPS 13. How to solve this problem?

Can you give us more information regarding your computer?

Also, did you encrypt your disk during installation?

Yes without some more information about what DE and how you install exactly we can not help on that.
ID and password were asked on what screen?
If it is the Login screen to login to the Desktop you install it would show your username already and you only need to give the password.
If it exactly ask for “ID” and password I would say this is from Windows?

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