Install kalibr stepping on pit 5: E: Package 'python-software-properties' has no installation candidate

is only available from another source
However the following packages replace it:
  software-properties-common
E: Package 'python-software-properties' has no installation candidate

Just install software-properties-common instead

For <= 12.04

sudo apt-get install python-software-properties

for >= 12.10

sudo apt-get install software-properties-common