Network icons disabled and inconsistent behavior in 14.04

[AG]

I had a stable working ubuntu 64 bit 14.04. I had wired, wireless and mobile broadband configured and working on it. (airtel and tata photon plus 4G and 3G dongles configured respectively.)
I could select the connection from the network icon at top of the screen and choose whichever connection to use.

Yesterday I tried a ZTE dongle. It was not detected. So i installed Vodafone application it came with. After that I could use the Vodafone application dialer and use internet.
Then i rebooted machine. Now I am observing following:
1) while booting i get "Booting system without full network" and "waiting for network configuration"
2) did not get network icon in the menu.
3) system icon in has disappered ie left pane.

i tried few things like lightdm restart

ZTE donge details:
detected as : vodafone 19d2:1237 ZTE WCDMA Technologies
model : zte k 4201 I

Now i am getting to see two network icons in the top panel.
"Networking" and "WiFi" menu are disabled.

[AG (gore-amit)]

cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

#auto dsl-provider
#iface dsl-provider inet ppp
#pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf
#provider dsl-provider

auto eth0
#iface eth0 inet manual
iface eth0 inet dhcp

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1433655/+editstatus and add the package name in the text box next to the word Package.

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