Spadile won't work because it's written in C# and it's not really supported well on linux. The best solution would be to have some server browser which is multiplatform or do it manually:
wine client.exe -aos://1231412
I assure you it will work (as long as the server has slot for you).

AoS was really designed to work with Internet Explorer. Using the other browsers has always been difficult, although Nowa90 does offer one possible solution. Hopefull Ben will keep that compatibility issue in mind for future updates.

from the wiki
Want AOS to work in Wine?
chmod 700 aos???.msi
wine start aos???.msi
nano ~/.wine/drive_c/Ace\ of\ Spades/config.ini
echo "wine ~/.wine/drive_c/Ace\ of\ Spades/client.exe -\$1" > aos
chmod 700 aos
aos aos://numbers

tl;dr: Make the setup executable. Run it. Change your name. Use a script called aos to play from the command line.

associate it with firefox, or try spadille/chromium maybe. Are you using wine? you must be using wine

Alright i got a problem with spidle
It wont open

try using spaddile, it's far better than using browsers in my opinion.

WEll i don't really know how to work this but everytime i click on the server this message pops up

"Firefox doesn't know how to open this address, because the protocol (aos) isn't associated with any program."

Does anyone know how i can fix this?