GLIBCXX_3.4.11 not found

Helo,

After upgrading my gcc version, my ubuntu screen became blank(after login), i dont know what i have to do

what i did

1)Alt+Ctrl+F1---->after login it show errors like

/opt/quartus/linux/libstdc++.so.6:version 'GLIBCXX_3.4.11' not found (required by /usr/i386-linux-gnu/libproxy.so.1)

solution

sudo mv libstdc++.so.6 libstdc++.so.6.orig

sudo ln-s /usr/lib/libstdc++.so.6.0.9 libstdc++.so.6

and libgcc_s.so.1 also i did the same, then its working

2)Very next day its showing error like

apt-config:/opt/quartus/linux/libstdc++.so.6:verison glibcxx_3.4.11 not found (required by apt-config)

apt-config:/opt/qurartus/linux/libstdc++.so.6:version 3.4.15 not found (required by /usr/lib/i386-linux-gnu/libapt-pkg.so.4.12)

again i repeated the solution its showing libstdc++so.6 and libstdc++so.6.orgic are same, failed to create symbolic link, libstdc++.so.6: file exits

Kindly any help i dont know what i have to do.

Thanks,

Alex.