This is fixed the latest version of youtube-dl in Natty.
youtube-dl (2010.12.09-1) unstable; urgency=low
* New upstream release:
+ Use filename with suffix .part while the download is still incomplete.
+ Add support for downloading files from depositfiles.com.
+ Fix recent changes in youtube.com. Closes: #606537.
This is fixed the latest version of youtube-dl in Natty.
youtube-dl (2010.12.09-1) unstable; urgency=low
* New upstream release:
+ Use filename with suffix .part while the download is still incomplete.
+ Add support for downloading files from depositfiles.com.
+ Fix recent changes in youtube.com. Closes: #606537.