I am new in Linux. I got the following messages with some errors.
$ sudo apt-get install gazebo7
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:2 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Hit:3 http://archive.canonical.com/ubuntu xenial InRelease
Hit:4 http://ppa.launchpad.net/synapse-core/testing/ubuntu xenial InRelease
Hit:5 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease
Ign:6 http://linux.dropbox.com/ubuntu wily InRelease
Ign:7 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial InRelease
Hit:8 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:9 http://ppa.launchpad.net/ubuntu-mate-dev/welcome/ubuntu xenial InRelease
Hit:10 http://linux.dropbox.com/ubuntu wily Release
Ign:11 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial Release
Hit:12 http://packages.osrfoundation.org/gazebo/ubuntu-stable xenial InRelease
Ign:13 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Sources
Ign:15 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main i386 Packages
Ign:16 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main all Packages
Ign:17 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en_IN
Ign:18 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en
Ign:13 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Sources
Ign:15 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main i386 Packages
Ign:16 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main all Packages
Ign:17 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en_IN
Ign:18 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en
Ign:13 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Sources
Ign:15 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main i386 Packages
Ign:16 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main all Packages
Ign:17 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en_IN
Ign:18 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en
Ign:13 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Sources
Ign:15 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main i386 Packages
Ign:16 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main all Packages
Ign:17 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en_IN
Ign:18 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en
Ign:13 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Sources
Ign:15 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main i386 Packages
Ign:16 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main all Packages
Ign:17 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en_IN
Ign:18 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en
Err:13 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Sources
404 Not Found
Ign:15 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main i386 Packages
Ign:16 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main all Packages
Ign:17 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en_IN
Ign:18 http://ppa.launchpad.net/tomahawk/ppa/ubuntu xenial/main Translation-en
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/tomahawk/ppa/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.
W: http://packages.osrfoundation.org/gazebo/ubuntu-stable/dists/xenial/InRelease: Signature by key D2486D2DD83DB69272AFE98867170598AF249743 uses weak digest algorithm (SHA1)
E: Failed to fetch http://ppa.launchpad.net/tomahawk/ppa/ubuntu/dists/xenial/main/source/Sources 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
$ sudo apt-get install gazebo7
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:
gazebo7 : Depends: gazebo7-common (= 7.0.0+dfsg-2) but 7.1.0-1~xenial is to be installed
Recommends: gazebo7-plugin-base but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
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