Estou tentando instalar o octave no Ubuntu 16.04 recém-instalado. Então eu tentei estes comandos:
sudo apt-add-repository ppa:octave/stable
sudo apt-get update
sudo apt-get install octave
Depois de 'sudo apt-get update', recebi esses erros e avisos:
Err:9 http://ppa.launchpad.net/octave/stable/ubuntu xenial/main amd64 Packages
404 Not Found
Err:10 http://ppa.launchpad.net/octave/stable/ubuntu xenial/main i386 Packages
404 Not Found
W: The repository 'http://ppa.launchpad.net/octave/stable/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/octave/stable/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/octave/stable/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
E depois de "sudo apt-get install octave":
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
octave : Depends: libarpack2 (>= 2.1) but it is not going to be installed
Depends: libcholmod3.0.6 but it is not going to be installed
Depends: liboctave3 (= 4.0.0-3ubuntu9) but it is not going to be installed
Depends: libosmesa6 (>= 10.2~) but it is not going to be installed
Recommends: libopenblas-base but it is not going to be installed or
libatlas3-base but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Depois disso, quando eu tento 'sudo apt-get -f install':
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Eu tentei instalar dependências para que eu possa compilar o código-fonte, e erros semelhantes apareceram (sudo apt-get install libarpack2):
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libarpack2 : Depends: libgfortran3 (>= 4.6) but it is not going to be installed
Depends: liblapack3 but it is not going to be installed or
liblapack.so.3
E: Unable to correct problems, you have held broken packages.
O que posso fazer agora?
O 16.04 é novo e todos os pacotes não estão prontos para uso em todos os servidores. Usar o servidor principal para baixar pacotes resolverá seu problema.