I just updated to Ubuntu 12.04.
After the update I cannot resolve hostnames reliably:
I use Konsole in Unity. There sometimes the DNS resolving works fine and suddenly after two commands or so it fails for the same address.
E.g. I ping a machine without DNS-Suffix (the suffix is shown in my network config correctly aside 3 valid nameserver IPs) and everything works fine. Then I try to log into the machine with the same address via ssh and I get a "Name or service not known".
Trying again, it works with a fully qualified name containing the suffix. I also had cases, when the IP wasn't resolved although I put in the fully qualified name. When I am more lucky, it starts working again with machine names only (without suffix, which is configured and worked perfectly up to now)
Is there probably a bug in the new Ubuntu Version?
DistroRelease: Ubuntu 12.04
iface lo inet loopback
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
default via 192.168.1.1 dev wlan0 proto static
169.254.0.0/16 dev wlan0 scope link metric 1000
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.2 metric 2
Package: network-manager 0.9.4.0-0ubuntu4
PATH=(custom, no user)
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Uname: Linux 3.2.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH
Wired connection 1 a76f352c-6e8c-49c7-bc05-b890445abb22 802-3-ethernet 1336943434 Sun 13 May 2012 05:10:34 PM EDT yes no /org/freedesktop/NetworkManager/Settings/1
Ladner Computer Repair L.N.A 47560d22-54ec-491b-b90f-a41535d69f00 802-11-wireless 1337213171 Wed 16 May 2012 08:06:11 PM EDT yes no /org/freedesktop/NetworkManager/Settings/0
DEVICE TYPE STATE DBUS-PATH
wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/1
eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0
RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
running 0.9.4.0 connected enabled enabled enabled enabled disabled