/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

How can I get GLIBCXX_3.4.15 in Ubuntu? I can't run some programs that I'm compiling.

When I do:

strings /usr/lib/libstdc++.so.6 | grep GLIBC

I get:

GLIBCXX_3.4GLIBCXX_3.4.1GLIBCXX_3.4.2GLIBCXX_3.4.3GLIBCXX_3.4.4GLIBCXX_3.4.5GLIBCXX_3.4.6GLIBCXX_3.4.7GLIBCXX_3.4.8GLIBCXX_3.4.9GLIBCXX_3.4.10GLIBCXX_3.4.11GLIBCXX_3.4.12GLIBCXX_3.4.13GLIBCXX_3.4.14GLIBC_2.2.5GLIBC_2.3GLIBC_2.4GLIBC_2.3.4GLIBC_2.3.2GLIBCXX_FORCE_NEWGLIBCXX_DEBUG_MESSAGE_LENGTH

Thanks for any help!