The following packages will be upgraded: sudo 1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/342 kB of archives. After unpacking 0 B will be used. Do you want to continue? [Y/n/?] y (Reading database ... 195146 files and directories currently installed.) Preparing to unpack .../sudo_1.8.9p5-1ubuntu1.2_amd64.deb ... Unpacking sudo (1.8.9p5-1ubuntu1.2) over (1.8.9p5-1ubuntu1.1) ... dpkg: error processing archive /var/cache/apt/archives/sudo_1.8.9p5-1ubuntu1.2_amd64.deb (--unpack): unable to install new version of `/usr/bin/sudo': Device or resource busy Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Processing triggers for ureadahead (0.100.0-16) ... ureadahead will be reprofiled on next reboot Errors were encountered while processing: /var/cache/apt/archives/sudo_1.8.9p5-1ubuntu1.2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) A package failed to install. Trying to recover: