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I'm trying to run sudo apt update

And I get this message E: Malformed entry 1 in list file /etc/apt/sources.list.d/ros2-latest.list (Component) E: The list of sources could not be read.

Here is /etc/apt/sources.list.d/ros2-latest.list content:

deb [arch=amd64,arm64] http://repo.ros2.org/ubuntu/main main

Here is sources.list content:

# deb cdrom:[Ubuntu 20.04.1 _Focal Fossa_ - Release amd64(20200808.1)]/ focal main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://jp.archive.ubuntu.com/ubuntu/ focal main restricted
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://jp.archive.ubuntu.com/ubuntu/ focal-updates main restricted
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://jp.archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal universe
deb http://jp.archive.ubuntu.com/ubuntu/ focal-updates universe
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://jp.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://jp.archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://jp.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner

deb http://security.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://security.ubuntu.com/ubuntu focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse

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1 Answer 1

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The line in /etc/apt/sources.list.d/ros2-latest.list is wrong.

Change it to

deb [arch=amd64] http://repo.ros2.org/ubuntu focal main

You can do it by running

sudo nano /etc/apt/sources.list.d/ros2-latest.list

Ctrl+O to save Ctrl+X to exit.

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