Unable to locate mono packages in Ubuntu 14.04

Question

After updating Linux with:

sudo apt-get update

I'm trying to install referenceassemblies-pcl and ca-certificates-mono as per this article respectively using the below commands:

sudo apt-get install referenceassemblies-pcl
sudo apt-get install ca-certificates-mono

The command looks correct, as per ziyasal's answer but I'm getting these errors:

unable to locate package referenceassemblies-pcl

unable to locate package ca-certificates-mono

The outputs of

apt-cache policy ca-certificates-mono

apt-cache policy referenceassemblies-pcl

respectively are

Unable to locate package ca-certificates-mono

Unable to locate package referenceassemblies-pcl

The output of sudo apt-add-repository ppa:referenceassemblies-pci/ppa is:

Cannot add PPA: 'ppa:referenceassemblies-pci/ppa'.

Please check that the PPA name or format is correct.

The output of cat /etc/apt/sources.list.d/mono-xamarin.list

cat: /etc/apt/sources.list.d/mono-xamarin.list: No such file or directory

Quesion: What am I doing wrong here?

Solution 1

All works great. I assume, you forgot

sudo apt-get update

---

or simply start all steps again:

sudo rm /etc/apt/sources.list.d/mono-xamarin*
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
sudo apt-get update

---

% apt-cache policy referenceassemblies-pcl
referenceassemblies-pcl:
  Installed: 2014.04.14-1
  Candidate: 2014.04.14-1
  Version table:
 *** 2014.04.14-1 0
        500 http://download.mono-project.com/repo/debian/ wheezy/main i386 Packages
        100 /var/lib/dpkg/status

% apt-cache policy mono-complete          
mono-complete:
  Installed: 4.0.2.5-0xamarin1
  Candidate: 4.0.2.5-0xamarin1
  Version table:
 *** 4.0.2.5-0xamarin1 0
        500 http://download.mono-project.com/repo/debian/ wheezy/main i386 Packages
        100 /var/lib/dpkg/status
     3.2.8+dfsg-4ubuntu4 0
        500 http://de.archive.ubuntu.com/ubuntu/ vivid/universe i386 Packages

% apt-cache policy mono-complete          
mono-complete:
  Installed: 4.0.2.5-0xamarin1
  Candidate: 4.0.2.5-0xamarin1
  Version table:
 *** 4.0.2.5-0xamarin1 0
        500 http://download.mono-project.com/repo/debian/ wheezy/main i386 Packages
        100 /var/lib/dpkg/status
     3.2.8+dfsg-4ubuntu4 0
        500 http://de.archive.ubuntu.com/ubuntu/ vivid/universe i386 Packages

% apt-cache policy ca-certificates-mono
ca-certificates-mono:
  Installed: 4.0.2.5-0xamarin1
  Candidate: 4.0.2.5-0xamarin1
  Version table:
 *** 4.0.2.5-0xamarin1 0
        500 http://download.mono-project.com/repo/debian/ wheezy/main i386 Packages
        100 /var/lib/dpkg/status

Solution 2

Have you tryed this:

sudo apt-add-repository ppa:referenceassemblies-pci/ppa
sudo apt-get update
sudo apt-get -y install referenceassemblies-pci

and it might work fine this way.

Solution 3

The echo command to write to /etc/apt/sources.list.d/mono-xamarin.list might not work in your case. I had similar error when piping commands to a docker image - reported here (https://github.com/docker/docker/issues/8679).

In that case the solution to pipe to docker instead:

echo "deb http://download.mono-project.com/repo/debian wheezy main" | docker exec -i --user=root MyContainer tee /etc/apt/sources.list.d/mono-xamarin.list

If this is not the case, you could perhaps just write the file with the missing line in other ways.

Solution 4

I've got the same problem as what you say. But I found the reason at last: I shouldn't use the ctrl+c and ctrl+v to run the three commands at a time:

1.sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
2.echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
3.sudo apt-get update

In this way,there are actually only first command is excuted. So I run there command one by one,and the problem solved.

View more solutions

Comments

[A.B.]

Edit you question and add the output of apt-cache policy ca-certificates-mono and apt-cache policy referenceassemblies-pcl

[A.B.]

Add the output of cat /etc/apt/sources.list.d/mono-xamarin.list

[xameeramir]

cat: /etc/apt/sources.list.d/mono-xamarin.list: No such file or directory

[A.B.]

OK. I assume, that are also no other *xamarin* files in this folder. Follow the steps in my answer exactly and post the error messages.

[xameeramir]

I believe I did it. The article asked to update. Let me again give it a try.

[xameeramir]

Cannot add PPA: 'ppa:referenceassemblies-pci/Ubuntu'. Please check that the PPA name or format is correct.

[Fabby]

@BountyMan: If you like the answer, just click the little grey ☑ under the "0" now turning it into beautiful green. If you do not like the answer, click on the little grey down-arrow below the 0, and if you really like the answer, click on the little grey checkmark and the little up-arrow... If you have any further questions, go to askubuntu.com/questions/ask

[xameeramir]

@Fabby - +1 for all answers

[Fabby]

@BountyMan :D I'm not the poster, but anyway: you know the drill from StackOverflow: if it works, accept... ;-)

[xameeramir]

@Fabby - It's not working mann. I am pulling my hair because I have already done this before in the same machine. I uninstalled and reinstalled everything but why it is not happening now is my problem

[A.B.]

@BountyMan ppa:referenceassemblies-pci/ppa and not ppa:referenceassemblies-pci/Ubuntu

[Admin]

For clueless users: Despite the URL is specifying /debian wheezy, it is valid for Debian, Ubuntu and derivatives according to this documentation.

[xameeramir]

@clearkimura and Keld - I have stopped working on linux from a while. Thanks for your suggestion.

[xameeramir]

Although my problem is solved already, Thank you for your efforts. :)