It should be in universe according to this page.
http://packages.ubuntu.com/search?suite=defaultsection=allarch=anysearchon=nameskeywords=uget
Maybe try installation via terminal.
$ sudo apt-get install uget
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Of course it is in the universe component.
Seems unreproducible for now, please check your /etc/apt/sources.list
** Changed in: uget (Ubuntu)
Status: New = Incomplete
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Found that I have installed uget 1.7.0 before. After uninstall the newer
version, uget appears in the universe component.
** Changed in: uget (Ubuntu)
Status: Incomplete = Invalid
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