I use Ubuntu Studio 20.04 LTS in three PCs: two desktops and one laptop.
But, because some reason I don't know, into the Laptop there are not some DVD libraries I have in the desktops.
The libraries are related with the app mkvtoolnix, and the main is called: libdvdread4.
In the Laptop I have only the libdvdread7 library.
The missed library doesn't appear in the Synaptic Package Manager.
From command line, when I try to download and install the missed library, I get the message:
The package are obsolete or it cannot to be found. But, another package has a reference to it...
I don't know which could be the difference between the devices repositories. I checked it, more than twice, and... The repository lists are identical, in the three devices!!!
How can I get the libdvdread4 library to 20.04 environment? ???
The output to the apt-cache policy command, in the Laptop computer is:
Archivos de paquetes:
100 /var/lib/dpkg/status
release a=now
500 https://repo.skype.com/deb stable/main amd64 Packages
release o=. stable,a=stable,n=stable,l=. stable,c=main,b=amd64
origin repo.skype.com
500 http://ppa.launchpad.net/mscore-ubuntu/mscore3-stable/ubuntu focal/main i386 Packages
release v=20.04,o=LP-PPA-mscore-ubuntu-mscore3-stable,a=focal,n=focal,l=Stable releases of MuseScore 3,c=main,b=i386
origin ppa.launchpad.net
500 http://ppa.launchpad.net/mscore-ubuntu/mscore3-stable/ubuntu focal/main amd64 Packages
release v=20.04,o=LP-PPA-mscore-ubuntu-mscore3-stable,a=focal,n=focal,l=Stable releases of MuseScore 3,c=main,b=amd64
origin ppa.launchpad.net
500 http://ppa.launchpad.net/mikhailnov/pulseeffects/ubuntu focal/main i386 Packages
release v=20.04,o=LP-PPA-mikhailnov-pulseeffects,a=focal,n=focal,l=PulseEffects PPA,c=main,b=i386
origin ppa.launchpad.net
500 http://ppa.launchpad.net/mikhailnov/pulseeffects/ubuntu focal/main amd64 Packages
release v=20.04,o=LP-PPA-mikhailnov-pulseeffects,a=focal,n=focal,l=PulseEffects PPA,c=main,b=amd64
origin ppa.launchpad.net
500 http://ppa.launchpad.net/libreoffice/ppa/ubuntu focal/main i386 Packages
release v=20.04,o=LP-PPA-libreoffice,a=focal,n=focal,l=LibreOffice Fresh,c=main,b=i386
origin ppa.launchpad.net
500 http://ppa.launchpad.net/libreoffice/ppa/ubuntu focal/main amd64 Packages
release v=20.04,o=LP-PPA-libreoffice,a=focal,n=focal,l=LibreOffice Fresh,c=main,b=amd64
origin ppa.launchpad.net
100 http://cl.archive.ubuntu.com/ubuntu focal-backports/universe i386 Packages
release v=20.04,o=Ubuntu,a=focal-backports,n=focal,l=Ubuntu,c=universe,b=i386
origin cl.archive.ubuntu.com
100 http://cl.archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages
release v=20.04,o=Ubuntu,a=focal-backports,n=focal,l=Ubuntu,c=universe,b=amd64
origin cl.archive.ubuntu.com
500 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu focal/main i386 Packages
release v=20.04,o=LP-PPA-otto-kesselgulasch-gimp,a=focal,n=focal,l=gimp stable,c=main,b=i386
origin ppa.launchpad.net
500 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu focal/main amd64 Packages
release v=20.04,o=LP-PPA-otto-kesselgulasch-gimp,a=focal,n=focal,l=gimp stable,c=main,b=amd64
origin ppa.launchpad.net
500 https://dl.winehq.org/wine-builds/ubuntu focal/main i386 Packages
release o=dl.winehq.org,a=focal,n=focal,l=winehq,c=main,b=i386
origin dl.winehq.org
500 https://dl.winehq.org/wine-builds/ubuntu focal/main amd64 Packages
release o=dl.winehq.org,a=focal,n=focal,l=winehq,c=main,b=amd64
origin dl.winehq.org
500 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=multiverse,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/universe i386 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=universe,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=universe,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=main,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=main,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/restricted i386 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=restricted,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=restricted,b=amd64
origin security.ubuntu.com
500 http://archive.canonical.com/ubuntu focal/partner i386 Packages
release v=20.04,o=Canonical,a=focal,n=focal,l=Partner archive,c=partner,b=i386
origin archive.canonical.com
500 http://archive.canonical.com/ubuntu focal/partner amd64 Packages
release v=20.04,o=Canonical,a=focal,n=focal,l=Partner archive,c=partner,b=amd64
origin archive.canonical.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=multiverse,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=universe,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=universe,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=main,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=main,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/restricted i386 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=restricted,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages
release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=restricted,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/multiverse i386 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=multiverse,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=multiverse,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/universe i386 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=universe,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=universe,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/restricted i386 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=restricted,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/restricted amd64 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=restricted,b=amd64
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/main i386 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=main,b=i386
origin cl.archive.ubuntu.com
500 http://cl.archive.ubuntu.com/ubuntu focal/main amd64 Packages
release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=main,b=amd64
origin cl.archive.ubuntu.com
Paquetes con pin:
That's all from that command in the laptop computer.
