Starting pkremote on a system (as a regular user) does not detect the camera, giving the error "No camera connected".
Workarounds:
1) The user can run pkremote as root
2) Edit /etc/udev/rules.d/025_pentax.rules as root and change the following line:
ATTRS{vendor}=="PENTAX", ATTRS{model}=="DIGITAL_CAMERA", MODE="0666", GROUP="plugdev"
To developer: please repackage with udev file MODE="0666" by default.
Using Ubuntu 10.10 and a Pentax K10D
I recommend 0664 for the permissions. Better security practice to not allow just anyone write access to the device. This worked for me.