I wanna upgrade my Ubuntu from 11.04 to 12.04,but the internet is so slow when I use Synaptic or Update Manager,because they only make one connection to download packages like wget.( 6 ~ 7kbps ).

but when I use axel to download my speed is 160 kbps.

now I'm upgrading and it take 6days to be compelet by this speed.

is there any way to force it to use more than one connection to get packages?