You Probably be getting error like qemuwrapper path doesn't exist or failed to start qemu etc.
I was also getting the same error, but after few minutes of brain storming i found the solution.
I did this in Ubuntu12.04 with gns3
Follow the steps below.
1. Click EditMenu->preferences. Click on Qemu tab on the left side of panel. Then go to General Settings.
2. Set the Path to Qemuwrapper to /usr/share/doc/gns3/qemuwrapper.py
3.If you have KVM installed then type kvm in place of qemu in front of Path to qemu
for installing kvm type in terminal $sudo apt-get install kvm
I was also getting the same error, but after few minutes of brain storming i found the solution.
I did this in Ubuntu12.04 with gns3
Follow the steps below.
1. Click EditMenu->preferences. Click on Qemu tab on the left side of panel. Then go to General Settings.
2. Set the Path to Qemuwrapper to /usr/share/doc/gns3/qemuwrapper.py
3.If you have KVM installed then type kvm in place of qemu in front of Path to qemu
for installing kvm type in terminal $sudo apt-get install kvm
