I installed the POSBox image (I tried v14 and v15) on a Raspberry Pi 3, and everything worked great. Now I would like to use that RPi as a graphic POS, but when I type:
sudo apt-get install
I get
W: Unable to read /etc/apt/apt.conf.d/ - DirectoryExists (2: No such file or directory)
E: Could not open lock file /var/lib/dpkg/lock - open (2: No such file or directory)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
sudo
when you are logged in asroot
is redundant. Did you bother checking whether the paths it says cannot be accessed exist or not?