3.13.0-43.72) is not available, but a newer one is (3.13.0-166.216). We redirected you there.
/usr/share/java/com.android.dx.jar is in dalvik-exchange 7.0.0+r33-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/com.android.dx-1.12.jar