installing gimp plugin hugin

my websearch for how to install it led me to the instructions (
http://wiki.panotools.org/Hugin_Compiling_Ubuntu) which istructed me to:

sudo add-apt-repository ppa:hugin/hugin-builds; sudo apt-get update;
sudo apt-get install hugin enblend panini

which, after it ran, spat out:

Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package panini

but I later learned that panini just another program that can be used for
scaling batches of files and so isn't really necessary... I suppose. didn't
I just learn how to use 'convert' for this purpose. panini is a dependency
though. I thought dependencies were required.

In any case I read the gimp help file on installing pugins and it says
after the install of the plugin one needs to activate it. I tried following
their instructions but could not locate the hugin plugin in the tree nor by
"launch the Plugin Description dialog (from Xtns/Plugins Details). I
couldn't find the xtns menu.
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