Requirement: accessibility to a high speed internet (several Mb/s)
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If you don't have a fast internet connection at home, but in your office/university/...: Yes, this way will be useful for you! visit here, too. It's a related topic.
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1. Go to: http://archive.ubuntu.com/ubuntu/dists/ (Main Server)
You can also use the other mirrors:
Replace xy with the abbreviation of the country.
2. Choose the correct version of Ubuntu which you are using. For example: Oneiric
Note: Just oneiric, Not oneiric-backports, Not oneiric-proposed, Not oneiric-security & Not oneiric-updates
3. There are 4 directories:
Go to the each of directories and download the both binary & debian installer documents according to your Ubuntu stracture (32 bit(i386) or 64 bit(amd64)).
4. Downloaded .gz files have probably the same name! You can change their name. However, extract and open documents. Glance lines. Deb Files addresses come in lines that start with "Filename". We'll use this point:
you know that "Packeges" should be replaced with the correct name of each of extracted archive files that you have downloaded.
cat Packages | grep Filename >> lst.txt
5. Now, you have a/some text file(s). Open it/them with gedit> Ctrl+H> type below phrase in first field:
Note: there is a space character after ":". 2nd field should be filled with the mirror you like, in this form:
5. Employ a download manager and get all or some specified Debs in one try.
CLI Download Managers: Wget, Aria2(aria2c), Axel, Curl, Prozilla, ...
GUI Download Manager: Jdownloader, Uget, FatRat, Steadyflow, Tucan Manager, ...
sudo apt-get install aria2
sudo apt-get install axel
Torrent Clients: Tixati, Vuze, ...
=> How to utilize Aria2 for downloading URLs which are placed into a text file: