Should I go back to using my local Taiwan mirrors yet? deb http://ftp.tw.debian.org/debian experimental main contrib non-free deb http://ftp.tw.debian.org/debian unstable main contrib non-free A quick apt-get update tells me no, E: Release file for http://ftp.tw.debian.org/debian/dists/experimental/InRelease is expired (invalid since 128d 1h 31min 10s). Updates for this repository will not be applied.