Thanks,
Please try this fix posted to #821159:
Could you try adding this to /etc/apt-cacher/apt-cacher.conf or a file in
/etc/apt-cacher/conf.d:
index_files_regexp =
^(?:Index(?:\.bz2)?|(?:Sources|Packages|release)(?:\.(?:x|g)z|\.bz2)?|Release(?:\.gpg)?|InRelease|Contents-(?:[a-z]+-)?[a-zA-Z0-9]+\.gz|(?:srclist|pkglist)\.[a-z-]+\.bz2|Components-(?:avr32|amd64|alpha|arm|arm64|armel|armhf|hppa|hurd-i386|i386|ia64|kfreebsd-amd64|kfreebsd-i386|m32r|m68k|mips|mipsel|netbsd-alpha|netbsd-i386|powerpc|powerpcspe|ppc64|s390|s390x|sh4|sparc|sparc64|x32|all)\.yml\.(?:x|g)z|icons-(?:64|128)x(?:64|128)\.tar\.gz|Translation-[a-z]{2,3}(?:_[A-Z]{2}(?:\.[a-zA-Z0-9-]+)?)?(?:\.gz|\.bz2|\.xz|\.lzma)?)$
And then restart the daemon.
Mark
