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I was using GNS3 network simulator fine for a while & then after few days When I start GNS3 Network Simulator, it is giving out following error, not sure what caused this.

$ sudo gns3 

GNS3 GUI version 1.5.2
Copyright (c) 2007-2016 GNS3 Technologies Inc.
your locale en_IN.ISO8859-1 encoding is not UTF-8, switching to the UTF-8 version...
2016-12-23 22:57:53 INFO logger.py:107 Log level: INFO
/usr/share/gns3/gns3-gui/bin/python: symbol lookup error: /usr/local/lib/libQt5DBus.so.5: undefined symbol: _Z28qEnvironmentVariableIntValuePKcPb

I tried reinstalling gns3 but the error persisted.

While Un-installing, I got the following warnings:

dpkg: warning: while removing gns3-gui, directory '/usr/share/gns3/gns3-gui/lib/python3.4/__pycache__' not empty so not removed
dpkg: warning: while removing gns3-gui, directory '/usr/share/gns3/gns3-gui/bin' not empty so not removed
Removing gns3-server (1.5.2~trusty1) ...
dpkg: warning: while removing gns3-server, directory '/usr/share/gns3/gns3-server/lib/python3.4/__pycache__' not empty so not removed
dpkg: warning: while removing gns3-server, directory '/usr/share/gns3/gns3-server/bin' not empty so not removed

So I removed /usr/share/gns3* and then tried installing GNS3 no luck.

Tried the following suggestions made in this answer Commented the line "/usr/local/lib" in the file /etc/ld.so.conf.d/libc.conf but no use.

Also when I tried installing GNS3 through Ubuntu Software Center

enter image description here

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  • please state your question clearer and add more details.
    – viuser
    Dec 23, 2016 at 17:49
  • updated the question
    – karthik v
    Dec 23, 2016 at 18:32

1 Answer 1

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After having removed/commented out /usr/local/lib in /etc/ld.so.conf.d/libc.conf, you also need to run sudo ldconfig to update the library cache.

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