I'm new to the forum. Have little experience with Ubuntu.
I needed to install an epson scanner and a scanner program. I managed to make the scanner program xsane and iscan work. These did not suffice for the work I have so I bought Vuescan in order the do my work on this platform. (I'm going to scan a lot of slides).
Vuescan did not work immediately. It reported some problems with the libstdc++.so.6 (.21 and .20 versions?)
I tried to fix the problems using first the desktop installer system. This was not possible. I kept getting errors and were not able to get a long this way.
I reverted to terminal and used apt-get different ways tracing solutions I found on the net.
Then I happened to install wrong version of the libstdc++ (for amd64) in place of the intel version i need. My mistake.
I tried different things to remove and reinstall the old version. Latest I have copied the ubuntu 14.04 intel versions of the libstdc++.so.6 and -.so.5 files into the /usr/lib/x86_64-linux-gnu/. Library.
What I see when I boot is: ubuntu fails to start the desktop. It reaches the login prompt and tries to start the desktop but reverts to the login prompt. I can start a terminal on ctrl alt f4. This gives some error messages. If I try to start apt-get I get similar errors: apt-get: error while loading shared libraries: libstdc++.so.6 invalid ELF header.
What can I do to locate the problem. What can I do to make the desktop to start. It keeps reverting to the login prompt.