Rishabh Sharma writes
Why we are getting this error when libhtml-strip-perl is already installed.
It was not. root@modin~# aptitude search strip p boinc-cgi-stripchart - CGI script for plotting basic statistical p bomstrip - tool to strip Byte-Order Marks from UTF-8 p dailystrips - view web comic strips more conveniently p libchart-strip-perl - Draw strip chart type graphs p libhtml-strip-perl - strip HTML markup from text p libhtml-stripscripts-parser-per - module to filter scripts out of HTML p libhtml-stripscripts-perl - module for removing scripts from HTML p libpod-strip-perl - remove POD documentation from Perl code p photofilmstrip - Slideshow creator with Ken Burns effect p smistrip - extract MIB from text files like RFC p sslstrip - SSL/TLS man-in-the-middle attack tool root@modin~# aptitude install libhtml-strip-perl The following NEW packages will be installed: libhtml-strip-perl 0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 17.0 kB of archives. After unpacking 87.0 kB will be used. Get: 1 http://mirror.hetzner.de/debian/packages/ testing/main libhtml-strip-perl amd64 1.06-1+b2 [17.0 kB] Fetched 17.0 kB in 0s (891 kB/s) Selecting previously unselected package libhtml-strip-perl. (Reading database ... 70788 files and directories currently installed.) Unpacking libhtml-strip-perl (from .../libhtml-strip-perl_1.06-1+b2_amd64.deb) ... Processing triggers for man-db ... Setting up libhtml-strip-perl (1.06-1+b2) ... [ Rootkit Hunter version 1.4.0 ] File updated: searched for 169 files, found 142, broken links 1 E: Problem executing scripts DPkg::Post-Invoke 'if [ -x /usr/bin/rkhunter ] && grep -qiE '^APT_AUTOGEN=.?(true|yes)' /etc/default/rkhunter; then /usr/share/rkhunter/scripts/rkhupd.sh; fi' E: Sub-process returned an error code A package failed to install. Trying to recover: I installed it on the wrong machine before. Cheers, Thomas Krichel http://openlib.org/home/krichel http://authorprofile.org/pkr1 skype: thomaskrichel