Debian User Forums

Hi all,
I recently migrated all my data from an old laptopt with Win7+Debian dual boot to a brand new one with Win11+Debian 11 Bullseye dual boot.
Everything seemed hunky dory until I tried to add some numbers to a Libreoffice Calc file (which btw opened as "read only" initially) and it turned out I could not save the file. I tried copying it and renaming it but that doesn't work either. It seems I can't create or alter any files in my filesystem (not just Libreoffice stuff).

I checked permissions and I can't see the problem: my username and UID are identical on both laptops and every directory and file has me as owner and rwx as permissions for the owner. Only the toplevel directory /media has root as owner and the following as permissions: drwxr-x---+ but that's the same on the old laptop and I had no trouble there.

Can anyone enlighten me? Thanks in advance.

I don't know Win11 but Win10 had a common problem in that if Fast Startup was active in Win, it could leave all files in an NTFS partition in a hybrid suspend state which would subsequently appear as read-only in Linux. Check if Fast Startup is active in Windows and disable it. I tested it once and startup was ~2 seconds faster but shutdown was way more seconds slower so it's ultimately useless.
Note it's NOT the same as Fast Boot in BIOS/UEFI setup, that's irrelevant to this issue.

Thanks for solving my problem so swiftly and accurately, sunrat.
Win11 being Win10 with some extra intrusion into one's privacy (as far as I understand), it has indeed Fast Startup enabled by default. Disabling this allowed me to open said Calc file in the normal way and saving it after adding data.

@guy13 You're welcome!
Please edit the title of your first post to add prefix [Solved] so it may help others.