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• On the disconnected (air-gapped) computer we will firstly determine which pre-installation required packages need to be downloaded:

  # Navigate to a clean directory to download packages to mkdir -p /tmp/omk_opXyz_packages cd /tmp/omk_opXyz_packages/ # Extract the list of dependent packages - I've used sort and formatted the results # to make the needed comparison to those packages already installed easier: # to see  the unsorted results run command apt-cache show tar apt-cache show tar|grep "Pre-Depends:"|sed -e 's/Pre-Depends:\s\+//' -e 's/,\s*/\n/g'|sort|uniq libacl1 (>= 2.2.51-8) libc6 (>= 2.17) libselinux1 (>= 1.32) # Now we check each package and package-version against the dependency lists above: dpkg -s libacl1|grep -e "Status:" -e "Version:" Status: install ok installed Version: 2.2.52-3+b1 dpkg -s libc6|grep -e "Status:" -e "Version:"Status: install ok installed Status: install ok installed Version: 2.24-11+deb9u4 dpkg -s libselinux1|grep -e "Status:" -e "Version:" Status: install ok installed Version: 2.6-3+b3 # From the above checks on this disconnected (air-gapped) computer, we have ascertained that no packages are needed.

  
  

• Using the connected computer with same OS and Version we would now fetch the pre-installation required packages:

  # Download each of the dependent packages, here using libacl1 as an example, even though it is not actually needed in this case: apt-get download libacl1 Get:1 http://ftp.us.debian.org/debian stretch/main amd64 libacl1 amd64 2.2.52-3+b1 [28.1 kB] Fetched 28.1 kB in 1s (16.6 kB/s) # Downloaded packages will now be in the current directory and ready for transferring to the disconnected (air-gapped) computer where they will be installed: ls -la -rw-rw-r--. 1 user user 4463036 Apr 3 21:12 libacl1_2.2.52-3+b1_amd64.deb

  
  

• On the disconnected (air-gapped) computer we will now install the downloaded required packages:

  # Install each of the downloaded required packages, here using libacl1 as an example, even though it is not actually needed in this case: sudo apt-get install libacl1_2.2.52-3+b1_amd64.deb