I'm a Linux noob but a longtime Windows/DOS user. I'm running Ubuntu Trusty on an air-gap network (see below).

As a baseline, I'm already able to use APT with an offline Ubuntu repository to install anything that's available in the Ubuntu repos: main, universe, etc. My offline Ubuntu repository is stored on a USB hard drive. I'm having difficulty doing the same thing with a PPA repository.

My setup is:

A. Windows 7 PC connected to Internet through corporate network.
B. Ubuntu (Trusty) PC on "air-gap" network.

I want to use APT to install KiCad 4 (h++p://kicad-pcb.org/download/ubuntu/) on my air-gap Ubuntu PC.

I've done the following on the Windows PC:
1. I setup pyapt-mirror, h++ps://launchpad.net/pyapt-mirror, on my Windows PC.
2. I pointed pyapt-mirror to the KiCad repo: h++p://ppa.launchpad.net/js-reynaud/kicad-4/ubuntu trusty main
3. I ran pyapt-mirror and successfully downloaded the PPA to my Windows PC.
4. I copied the local mirror from my Windows PC to a USB hard drive.

I've done the following on the Ubuntu PC:
5. Moved the USB hard drive to my Ubuntu PC and used 'tree -d' to confirm that the PPA is visible:

├── dists
│   └── trusty
│       └── main
│           └── binary-amd64
└── pool
    └── main
        ├── k
        │   ├── kicad
        │   ├── kicad-doc
        │   ├── kicad-i18n
        │   └── kicad-library
        └── w
            ├── wxpython3.0
            └── wxwidgets3.0
  1. I created the sources list file like this:

    sudo gedit /etc/apt/sources.list.d/sources.list

  2. In that file, I added this string (the only string in the file):

    deb file:///media///ppa.launchpad.net/js-reynaud/kicad-4/ubuntu trusty main

Note that I opened Ubuntu Software Center and selected Edit -> Software Sources… -> Other Software.. and I can see my new entry:

file:///media/<user>/<volname>/ppa.launchpad.net/js-reynaud/kicad-4/ubuntu trusty main
  1. In a terminal I typed:

    sudo add-apt-repository –yes ppa:js-reynaud/kicad-4

After a few seconds it responds:

Cannot add PPA: 'ppa:js-reynaud/kicad-4'. Please check that the PPA name or format is correct.

I need some suggestions for what to try next.



  • I don't know the answer but another question says that this error can be caused by Ubuntu not being able to access the certificate to verify the PPA's digital signature. Based on this question, it seems like you will have to manually get the GPG key for the PPA and add it to your keyring. This is just a guess. – indiv Sep 20 '17 at 18:55

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