I have also the problem with two PC (Kubuntu 15.04) linked to the same router. Sometimes I have network after the boot, sometimes not.
I have found this message in dmesg when I have no network:
[ 7.195372] systemd[1]: Job NetworkManager.service/start deleted to break ordering cycle starting with network.target/start
This bug is quite annoying. When there is this problem, I reboot the machine.
I have also the problem with two PC (Kubuntu 15.04) linked to the same router. Sometimes I have network after the boot, sometimes not. service/ start deleted to break ordering cycle starting with network. target/ start
I have found this message in dmesg when I have no network:
[ 7.195372] systemd[1]: Job NetworkManager.
This bug is quite annoying. When there is this problem, I reboot the machine.