I have faced problems several time while trying start Skype. It doesn’t open, even trying from  terminal! instead of printing this errors
skype: symbol lookup error: /usr/lib/i386-linux-gnu/libQtOpenGL.so.4: undefined symbol: _ZNK14QWidgetPrivate17hasHeightForWidthEv

Solution

1. Open terminal type ~$ sudo nano /etc/ld.so.conf.d/skype.conf
2. Add this line ` /usr/lib/i386-linux-gnu/mesa/` and press Ctl+X
3. Finally ~$ sudo ldconfig -v

* My Ubuntu version 14.04 LTS, it should work since 12.04 LTS

** Common FAQ

• Question: I have already done above & working perfectly but when applying new updates; same problem happen.
• Answer: Don’t panic please just follow 3 no step. ~$ sudo ldconfig -v

Credit AskUbuntu

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Another problem may facing Ubuntu user for Skype, that is Skype open just for a while and stop or could be continuous restarting. [Recently 20th Dec, 2015 I faced this problem, although my OS version is Ubuntu Server 14.04 LTS ]

Solution:

• Make sure you have sqlite3 installed in your PC. Other than you can install it easily by following this instruction
• Go to your terminal (CTRL + ATL +  T)
• Precaution: The following attempts will remove all of your previous files transfer history
• $ sqlite3 ~/.Skype/[YOURUSER}/main.db
• > sqlite> DELETE FROM Messages WHERE type=68;
• > .quit
• Congratulation you are done! Try to start skype.