Is there any way to backup installed software, install a fresh Ubuntu system, and restore the software on the newly installed system, without an Internet connection? I already cleared my apt cache.
You can use dpkg : sudo dpkg --get-selections > backup
and then you copy backup, and then you reinstall and use
( not from me, found on http://syslog.tv/2010/07/02/using-dpkg-selections-to-backup-and-install-packages/ )
However, you need to have the same sources.list ( especially if you used ppa ), so I recommend to make a copy of /etc/apt/. If you plan to upgrade the Ubuntu version, not all versions would be identical, so maybe that's not exactly what you want
Steps to reinstall packages
1.Ctrl + Alt +T(Opens Terminal)
2.cd to the "backup" directory
Eg: "cd /media/usb/backup"
3.Run the Following in terminal
Source :Facebook doc
If it lead to broken dependencies open the terminal and type
This one-liner will tar up all the (official) files of your installed packages:
Install and use 'aptoncd'
This will take whatever you have in /var/cache/apt/archives and create a media (CD-DVD) to use to install software via apt. You can the upgrade and install the same set of softwares in several machines with no need to re-download those packages again.