You are somewhat able to this at the moment with the advanced search functionality (Well you only sort by newest). If you search for intags:mine is:question isanswered:no hasaccepted:no closed:no
in the search box at the top right, you would get get the same result as you would if you clicked the UnansweredUnanswered tab.
But in this case, since this is a search result, you would be able to sort by any of these 4 options:
- relevance
- newest
- votes
- active
This is a direct link to the search result on the main site and sorted by date:
http://askubuntu.com/search?tab=newest&q=intags%3amine%20is%3aquestion%20isanswered%3ano%20hasaccepted%3ano%20closed%3anohttps://askubuntu.com/search?tab=newest&q=intags%3amine%20is%3aquestion%20isanswered%3ano%20hasaccepted%3ano%20closed%3ano
P.S. You need both isanswered:no
and hasaccepted:no
to correctly filter them and have the same result as the Unanswered tab. As questions with an accepted answer but with a vote of 1 or less, is not being considered as answered in the search results. But it is considered answered in the Unanswered tab.