I couldn’t fix this issue for a while now and I was offline on Skype for more than a month now.
skype: symbol lookup error: /usr/lib/libQtNetwork.so.4: undefined symbol: _ZN14QObjectPrivate15checkWindowRoleEv
I tried a lot fixing the above issue by reinstalling the libQT4 libraries, even tried downgrading them to previous version along with Skype. But no luck.
Today I just thought of fixing this issue while studying for my exams. While searching for the similar error in google, found that there have been many other who are affected by this problem.Solution was also found to be documented in Ubuntu website.
You need to remove the line /opt/nessus/lib from /etc/ld.so.conf and run sudo ldconfig in the console or try the static Skype version available for download to resolve this issue.
Peace.
