Do not setup a global proxy in System Settings! If you already have then set it back to Direct Connect.

Everything must be manually handled. If it's a new iKubuntu nstall start Adept under the main system menu under System. Select Manage Repositories from the File menu and enable all lines starting with deb.

Open up the terminal so we can edit a couple of files. Kate is just a text editor, use whatever you like, gedit, vim, whatever. This command will  open apt.conf file in Kate as root.

$ sudo kate /etc/apt/apt.conf

Comment # out what is already there and add your proxy. Should look like below with your auth info:

#Acquire { http { Proxy 'false'; }; };
Acquire::http::Proxy "http://usern: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it :port_num";


Now apt-get and Adept and updater should be happy.

Now to setup the proxy under your account for use with other internet applications, Firefox, etc. About the same as above except this file is owned by you so no root permissions are needed.

$ kate /home/your_user_name/.bash_profile

Add:

export http_proxy = "http://usern: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it :port_num"

Life should be good for most things. If you need to use wget at the command line enter the export line before running wget i.e., export http_proxy = "http://usern: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it :port_num"

for ftp support add this also if you need it:
   

export ftp_proxy = "http://usern:
 This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
 :port_num"