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hi I am new to ros and trying to follow a ros2 installation tutorial form this YouTube video (https://www.youtube.com/watch?v=-AouIEGbmM0) but i keep getting the same error constantly I have tried the solutions provided above but did not improve anything I am using ubuntu in a virtual machine on Mac.
parallels@ubuntu-linux-20-04-desktop:~$ sudo apt-key del 421C365BD9FF1F717815A3895523BAEEB01FA116
OK
parallels@ubuntu-linux-20-04-desktop:~$ sudo -E apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
Executing: /tmp/apt-key-gpghome.6cydgLlBka/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
gpg: keyserver receive failed: No name
parallels@ubuntu-linux-20-04-desktop:~$ sudo ntpdate time.windows.com
sudo: ntpdate: command not found
parallels@ubuntu-linux-20-04-desktop:~$ sudo -E apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
Executing: /tmp/apt-key-gpghome.Ug3PX2PVGh/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
gpg: keyserver receive failed: No name
parallels@ubuntu-linux-20-04-desktop:~$ sudo apt clean && sudo apt update
Get:1 http://packages.ros.org/ros/ubuntu focal InRelease [4,676 B]
Err:1 http://packages.ros.org/ros/ubuntu focal InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
Hit:2 http://ports.ubuntu.com/ubuntu-ports focal InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
Hit:5 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
Reading package lists... Done
W: GPG error: http://packages.ros.org/ros/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
E: The repository 'http://packages.ros.org/ros/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
parallels@ubuntu-linux-20-04-desktop:~$
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