OK, sorry if I am a bit late in replies.
There are two possible scenarios
1: you have mounted the partition in 'read-only' mode, which is ok. And that is probably the reason why you are not seeing any "delete" options when you right-click on that file.
or
2: Your NTFS partition is corrupt or damaged.
Here are your options:
1- Remount that partition in read/write mode in Ubuntu. Here is how:
https://askubuntu.com/questions/70281/why-does-my-ntfs-partition-mount-as-read-only
https://unix.stackexchange.com/ques...ndows-hibernated-partition-in-read-write-mode
OR
2- If that is hard to follow, And if you are having trouble working with Linux just yet, you can go into windows recovery mode and try to remove that file.
Here is how:
If you are in Linux reboot the system, remove the flash USB stick, and log into windows like you normally would.
I assume you are running windows 10. In Windows 10 go to settings, by pressing the WinKey+I shortcut, or by opening it using the start menu. In Windows, settings go to:
Update and recovery >> Recovery. On the "Recovery" page there should be an option named "Advanced startup" and right below it there should be a button named "Restart now". After you are in the Recovery environment, click on the "See advanced repair options", after that click on Troubleshoot >> Advanced options >> Command prompt.
The whole point is to get to the X environment, or the recovery environment of windows BUT with the command prompt, We need to see a command prompt like this:
With X:\ on there
If the above is confusing you you can try getting to the recovery command prompt (X:\) buy running this command when you are logged in normally into windows:
shutdown /r /o /t 30
that "30" there is how many seconds you need before restart and getting to the advanced boot options, if instead of 30, you put in 1, your system will restart instantly. /r means restart the system, and /o means "get me to the advanced boot options", and that /t there is to let you adjust the time.
After you are in the recovery command prompt with X:, simply type in:
notepad
and hit enter, a notepad window opens up, in this notepad windows go to the File menu >> then Open, (or using the shortcut key Ctrl+O) in the open dialogue window, at the bottom right there should be a dropbox that reads "Text Documents (
.txt)" change it to "All Files (.*)" and then try to browse to the AVI file that you are trying to delete, after you found the AVI file, select it and hit the shortcut keys (Shift + Delete) on your keyboard, and see if the file is deleted or not.
Let me know if this deletes the file or not. If it does just restart the system after the file is deleted, and then log back into windows normally to see if it is deleted, if it is not deleted, then we have to look into what is keeping the file in place.
Just let me know and I will try to help if I can.