LD_LIBRARY_PATH contains the traditional /lib directory,
but not the multiarch directory /lib/aarch64-linux-gnu.
It is not safe to upgrade the C library in this situation;
please remove the /lib/directory from LD_LIBRARY_PATH and
try again.
dpkg: error processing archive /var/cache/apt/archives/libc6_2.19-18+deb8u10_arm64.deb (–unpack):
subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
/var/cache/apt/archives/libc6_2.19-18+deb8u10_arm64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
How should we solve this problem?