Ubuntu – How to enable the “Universe” repository from the command line?

command linepackage-managementsoftware-sources

How do you use terminal to enable Universe source?
Or any those 4 from Software Sources: Main, Universe, Restricted, Multiverse
Main is on by default and Restricted is on if durring Ubuntu installation i tick Enable Restricted Formats.
Answer with line where version checked so it auto detects it.
Like command I know for partner but that goes to Other Software tab sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"

Best Answer

I finally found answer myself. To put all ubuntu sources to work without clicking them just enter in terminal

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) main universe restricted multiverse"

So for just "Universe" would be

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"

You can then check in Software sources it will show it works now. You can delete manually from sudo gedit /etc/apt/sources.list line http://archive.ubuntu.com/ubuntu lucid main universe restricted multiverse and save and see in Software sources nothing is ticked. Then do

 sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"

& that makes Just universe ticked. For all enabled do

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) main universe restricted multiverse"

you can add also partner repository with different link (see difference is ubuntu to canonical)

sudo add-apt-repository "deb http://archive.canonical.com/ubuntu $(lsb_release -sc) partner"

$(lsb_release -sc) makes checking your Ubuntu version and putting its name in link. Since 10.04 is called lucid then you can test in terminal lsb_release -sc gives word lucid Thats makes added repository link precise name of your ubuntu Release in Software sources. Wrong word and noting will work.

for all differences in repositories read https://help.ubuntu.com/community/Repositories/Ubuntu

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Ubuntu – Apt-Get Update: failure to fetch; can’t connect to any sources

Yes, the name server update does work and if it does work then you've probably updated your IP settings to be static and your server can no longer resolve URLs.

Try the above and if it works, reboot. If it fails after rebooting, then do this:

Edit the template file for the resolv.conf. Ubuntu server rebuilds this every boot.

sudo vi /etc/resolvconf/resolv.conf.d/tail

#add just these two lines >>
nameserver 8.8.8.8
nameserver 8.8.4.4

Then save the file and restart the service:

sudo /etc/init.d/resolvconf restart

8.8.8.8 and 8.8.4.4 are just Google's Name Servers. You should be able to add in your own ISP's if you want. If you don't like vi, use nano or vim.

I figured it out reading this article. So credit to them for the tip.

Ubuntu – Why is there a minus sign instead of a check mark in the software sources configuration window

It means that not all repositories have a deb-src repository enabled. It's the equivilent of a half-tick.

You can find the repos without source with this command:

comm -3 \
    <(grep -Eo '^deb[^#]+' /etc/apt/sources.list{,.d/*.list} | sed 's/^[^ ]* //;s/#.*$//;s/ +$//' | sort -u) \
    <(grep -Eo '^deb-src[^#]+' /etc/apt/sources.list{,.d/*.list} | sed 's/^[^ ]* //;s/#.*$//;s/ +$//' | sort -u)

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