It is the case of other repositories are added to the default data. The incorrect repositories can cause errors.
Restoring default repositorires will help.
1. Open the file with an editor.
# vi /etc/apt/sources.list
2. Replace the contents with default data.
deb http://br.archive.ubuntu.com/ubuntu/ xenial main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial main restricted
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
deb http://br.archive.ubuntu.com/ubuntu/ xenial universe
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial universe
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
deb http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu xenial-security main restricted
deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://security.ubuntu.com/ubuntu xenial-security universe
deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://security.ubuntu.com/ubuntu xenial-security multiverse
deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial main restricted
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
deb http://br.archive.ubuntu.com/ubuntu/ xenial universe
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial universe
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
deb http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu xenial-security main restricted
deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://security.ubuntu.com/ubuntu xenial-security universe
deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://security.ubuntu.com/ubuntu xenial-security multiverse
deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
3. Remove all files/directories from the directory.
# rm -rf the /etc/apt/sources.list.d/*
| Check environment | |||
| O S | Ubuntu 15.10 (64bit) | CPU | Intel i7-4710MQ 2.50GHz |
| SHELL | GNU bash (4.3.42) | GPU | Gallium 0.4 on SVGA3D |
| RAM | 984MiB | ||