When dpkg is interrupted, it can leave packages in an inconsistent state. Running 'dpkg --configure -a' will help resolve the issue by configuring all packages. The "cache-open failed" error may indicate a problem accessing the package cache, which can be resolved by updating the package lists with 'sudo apt update'.

The command (to be run in a terminal window) is:

sudo apt-get install apache2

To install a Debian package use the Terminal... sudo dpkg -i yourFile.deb Note: deb packages are actually arpackages containing tar.gz packages, see the manuals of ar, tar and gzip for details.

ksensors does not need hddtemp to run as deamon set suid root on hddtemp (debian: dpkg-reconfigure hddtemp) and run ksensors as a normal user.