I've been a Debian user for probably a decade now, and started to notice a new error message, possibly after a recent upgrade. If you run the 'df' command as a non-root user you get this message first:
'df: /run/user/1000/doc: Operation not permitted'
Searching around, it seems that this has been a known bug of the past in various distros. Seems that the fuse.portal filesystem should be masked as a dummy fs (within coreutils?) so that commands like df needn't throw a visible error.
But it's odd that I'm only just noticing it now. I don't run flatpak or snap, and can't figure out which package may have brought it down. I'm noticing this on systems with the most recent+patched Debian 11, one with MATE and the other with the Cinnamon desktop.
Out of curiosity, I rebooted the MATE machine but didn't login. From a different PC I ssh'd into it, issued 'df' and did not see this error message. So presumably it's something loaded by the windowing environment.
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/run/usr/1000/doc bug with 'df' and xdg-document-portal
Re: /run/usr/1000/doc bug with 'df' and xdg-document-portal
You could just type "mount" and see what/who mounted /run/user/1000/doc.
Maybe it's some folder which is mounted automatically by your desktop environment, but for which you don't have read permissions? AFAIK /run/user/$USERID/ is used by gvfs and such.
Maybe it's some folder which is mounted automatically by your desktop environment, but for which you don't have read permissions? AFAIK /run/user/$USERID/ is used by gvfs and such.