How to delete old and stuck local time machine snapshot from one year ago I have an old and stuck local time machine snapshot or directory (probably from Mac OS 10.14/Mojave/2018) that seems impossible to delete (now on Mac OS 10.15/Catalina/2019).
The directory is empty (0 kB) and located here:
/com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons Mac/2019-09-19-223308

But it does not show up if I run:
% tmutil listlocalsnapshots /                
Snapshots for volume group containing disk /:
com.apple.TimeMachine.2020-08-03-161551.local
com.apple.TimeMachine.2020-08-03-162946.local

If I try to delete the directory, I get a error message that the directory is a read only file system:
% rm -rf /com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons\ Mac/2019-09-19-223308 
rm: /com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons Mac/2019-09-19-223308/Macintosh HD: Read-only file system
rm: /com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons Mac/2019-09-19-223308: Read-only file system

Same happens if I try to delete the old local snapshot root directory.
% rm -rf /com.apple.TimeMachine.localsnapshots
rm: /com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons Mac/2019-09-19-223308/Macintosh HD: Read-only file system
rm: /com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons Mac/2019-09-19-223308: Read-only file system
rm: /com.apple.TimeMachine.localsnapshots/Backups.backupdb/Jons Mac: Read-only file system
rm: /com.apple.TimeMachine.localsnapshots/Backups.backupdb: Read-only file system
rm: /com.apple.TimeMachine.localsnapshots: Read-only file system

This also happens if I disable SIP.
Does someone have an idea how I get can rid of this directory?
It is not possible to delete those orphaned Time Machine snapshots from the regular user space. You need to follow this steps to delete the folders:

Turn on your Mac and immediately press and hold keys Command (⌘) and R. Need help? (see About macOS Recovery)

Once you are in recovery mode, open from the menu Utilities &gt; Terminal.

In terminal you need to switch to your regular main HD. e.g. cd /Volumes/Mactintosh HD/.

Check if folder com.apple.TimeMachine.localsnapshots contains the orphaned snapshots. (if not you need to go back to /Volumes and find the right volume.

Go back to the HD folder from step 3.

Delete the folder rm -rf com.apple.TimeMachine.localsnapshots