Unfortunately, none of these worked for me. They all recommend some version of doing the /cleanup-image /revertpendingactions command, but this command is what is showing the Error 2 code for me.
In short, I cannot update Windows because of error code 0x800f081f.
To solve this error code, the most commonly recommended option is to use DISM.exe /Online /Cleanup-image /Restorehealth - but putting that command into command prompt gives me error code 582.
The most commonly recommended option to solve error 582 is to use DISM.exe /Image:C: /cleanup-image /revertpendingactions, which gives me error 2. To solve error 2, the most common solutions are to disable my antivirus (I use no antivirus besides Windows Defender, which I disabled and it made no difference), to make sure I have the latest DISM version (I do), or to use the command DISM.exe /Image:C: /cleanup-image /revertpendingactions - but this is precisely the command which is generating the error 2 in the first place! I am truly stumped.