Using apt-get at offline environment

#Prerequisites

• Prepare a Ubuntu running machine which is online
• Preferably better to build a online machine exactly the same as offline machine

#Procedures at online machine

• First, install whatever software you want to install to the online machine

1. Delete all .deb files at /var/cache/apt/archives
   sudo apt-get clean

2. Confirm .deb files are not present at /var/cache/apt/archives
   ls /var/cache/apt/archives

3. Install whatever software you want to install
   sudo apt-get install cacti

4. confirm .deb files are present at /var/cache/apt/archives
   ls /var/cache/apt/archives

5. Compress /var/chache/apt/archives to archives.tar.gz
   sudo tar -cvzf archives.tar.gz /var/cache/apt/archives

6. Copy archives.tar.gz from online machine to the offline machine via USB memory or whatever

#Procedures at offline machine

• Copy the .deb files from online machine to offline machine

1. Uncompress archives.tar.gz
   sudo tar -xvzf archives.tar.gz

2. Create your own repository and compress it to Packages.gz
   sudo apt-ftparchive packages . | gzip > Packages.gz

3. Add directory to Packages.gz and comment out all other deb sources.(Or delete all other deb sources)
   sudo vi /etc/apt/sources.list
+ deb file:///home/user/ ./

4. Update your packages
   sudo apt-get update

5. Install the software
   sudo apt-get install cacti