GLIBC_2.16 not found (required by adb)

Hi everyone,

I am facing the following issue on Travis Builds being run on open source pull requests during the
android-wait-for-emulator command.

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

After some R&D, I identify that Travis unable to execute adb command and produce following error message:

adb: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.16' not found (required by adb)

Note:
Here are the some builds:
TravisBuild #5974
TravisBuild #6004
TravisBuild #6016

What could be the issue and how to resolve this?

Thanks.

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