This bug was already addressed in the past by Marco d'Itri. Now it reappears. See the debian change log
[...] xfsdump (3.1.6+nmu1) unstable; urgency=medium * Non-maintainer upload. * Create in postinst the xfsdump and xfsrestore compatibility symlinks. This is needed to support merged /usr systems (closes: #767926) -- Marco d'Itri <m...@linux.it> Thu, 07 Jan 2016 22:44:28 +0100 [...] The problem is that the original xfsdump Makefile(s) (both the one under dump/ and the one under restore/) install the binary under /sbin and create a symlink to the binary under /usr/sbin. Of course this doesn't work when the system has /[s]bin and /usr/[s]bin merged. Looking at the past packages (3.1.6+nm1), the symlinking where dropped from the Makefile, and where added in the *.{postinst,postrm} hooks. I have to point out that the actual Makefile checks if the system is "/usr merged". However this check is performed only at build time and not at install time. So if the build host is not "/usr merged" and the target host is "/usr merged", the installation fails. So In my opinion, it should be re-enable the MD's change. BR G.Baroncelli -- gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it> Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5