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Just for the sake of anybody looking for the how to...here is how i did it. And i think installing a webadmin package should be the first thing you do after installing Ubuntu on your BBB. It sure saves a lot of time searching through config files and typing command line commands to get all the settings on the BBB right.

First, I installed Ubuntu 14.04 on my BBB. Then i had to change

Acquire::GzipIndexes "true";"

to

Acquire::GzipIndexes "false";"

(see also: https://groups.google.com/forum/#!topic/beagleboar...)

Here is how i did it:
Fired up Filezilla (FTP client) on my windows machine and got to /etc/apt/apt.conf.d
I openend the file "02compress-indexes" with Filezilla in my windows editor (Notepad++ in my case) and made the change mentioned above. After saving the file and closing my editor Filezilla asks to upload the changed file to my BBB. Of course i clicked yes.

Then i used ssh to log into my BBB and ran
wget -O- https://raw.github.com/Eugeny/ajenti/master/script... | sudo sh
which i found on http://support.ajenti.org/topic/349868-installing-...

Tadaa! It works. Great!