For me the Problem is solved with 15.10.
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https://bugs.launchpad.net/bugs/1408963
Title:
[Xbuntu 14.04, 14.10 and 15.04] Network manager stops working: iwl3945
:03:00.0: BSM
Similar behavior on a Dell inspiron 9400:
systemd[1]: Started Network Manager.
systemd[1]: Starting Network Manager Wait Online...
NetworkManager[8547]: error [1432706094.998351]
[platform/nm-linux-platform.c:2250] link_change(): Netlink error changing link
3: UP mtu 0 (1) driver 'iwl3945' udi