missing libc.so.6 in Ubuntu
 

I try sudo apt-get install libc.so.6
but cannot find such package.

I try sudo apt-get install '^libc6.*'

still have the same error.

Maybe the package name is glibc.

I already installed glibc and that's not the issue.

libc.so.6 is actually the GNU C library packaged in the glibc package. If you would miss that library on your system nothing would work.
Why do you think you are missing it?