404 not found does not have a Release file.

Hi Zachary,

We are currently not supporting PPA, our toolchains are available for download at
https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain

Kind regards,
Andre

If you look at the information page for that PPA https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa you can see that this PPA does not provide an software for the Ubuntu release that you are running.

It does not make sense to try adding that PPA to your system.

I recommend executing the command
sudo rm /etc/apt/sources.list.d/team-gcc-arm-embedded-ubuntu-ppa-focal.list

What exactly do you want to do?
I am not aware of any source for a package named gcc-arm-embedded, I only know gcc-arm-none-eabi (available in the standard Ubuntu repositories)

actually i don't know where to put the tool chains downloaded on the website and how to install it.

What exactly do you want to do?

@Manfred Hampl (m-hampl) thanks for asking. i want to install paparazzi in my ubuntu system. But the tool chains didn't work.

My interpretation of https://wiki.paparazziuav.org/wiki/Installation/Linux#ARM_embedded_toolchain is that installing the Ubuntu-provided package gcc-arm-none-eabi should be sufficient.

@Manfred Hampl (m-hampl) Sorry I tried but always said:
Err:8 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.

@Andre Vieira (andre-simoesdiasvieira) May i ask how and where to install this in Ubuntu when downloaded?

The package Manfred is referring to by 'Ubuntu-provided package gcc-arm-none-eabi' is not what 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu' would give you. If you remove that PPA from your sources list, depending on how you've added it you either delete the line from /etc/apt/source.list or remove the file that has it in /etc/apt/source.list.d/

And then do a 'sudo apt update' and 'sudo apt install gcc-arm-none-eabi'

Alternatively you can download the tarball from developer. I've seen you mention a zip file, we only have zip files for windows-based toolchains so I suspect you didn't download the correct one. Assuming you are using an x86_64 based ubuntu you want the file called 'arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi.tar.xz'. Then you need to make sure the binaries are in your PATH variable and the lib in your LD_LIBRARY_PATH. Or you move the contents of the bin, include, lib* to the /usr/bin, /usr/include, /usr/lib*. Though the latter makes it difficult to remove them later ;)

For getting rid of the "404 not found" error message I already gave the recommendation:

sudo rm /etc/apt/sources.list.d/team-gcc-arm-embedded-ubuntu-ppa-focal.list

Please use the "I still need an answer" button at the end of your question page to set the status back to open!

@Andre Vieira (andre-simoesdiasvieira) Thank you. I have already downloaded the arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi.tar.xz' and
extract to HOME. It's this right? what should i do next? because i do "sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
sudo apt-get update
sudo apt-get install gcc-arm-embedded" when extracted .xz file BUT still have the problem."Err:7 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]"

I STILL NEED AN ANSWER

@rManfred Hampl (m-hampl) Thanks for your reply and really appreciate it if you can check out this code which still have 404 problem.

zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
[sudo] password for zachary:
 This PPA is an alternative to toolchain released at https://launchpad.net/gcc-arm-embedded. The source codes for both are same. Currently supports Ubuntu 10.04/12.04/14.04/14.10 32 and 64 bit.

Detailed explanations to Launchpad PPA can be found at https://help.launchpad.net/Packaging/. That website explains how a PPA is set up and how to add existing PPA and install software from it.

Here are quick steps to install toolchain from this PPA on Ubuntu before 14.04:

Step1: Inside Ubuntu, open a terminal and input
       "sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa"

Step2: Continue to input
       "sudo apt-get update"

Step3: Continue to input to install toolchain
       "sudo apt-get install gcc-arm-embedded"

To remove installed toolchain, just input "sudo apt-get remove gnu-arm-embedded".
To update the toolchain, just repeat above step2 and step3.

If it reports error message of conflict to gcc-arm-none-eabi, which is likely if upgrading from 4.x to 5+, please uninstall it first with:
       "sudo apt-get remove gcc-arm-none-eabi"

Questions should be asked at https://answers.launchpad.net/gcc-arm-embedded

Bug can be filed at https://bugs.launchpad.net/gcc-arm-embedded/+filebug. It is highly encouraged to ask question first before filing a bug.
 More info: https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.

Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Ign:2 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:3 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal InRelease
Err:5 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Get:6 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Hit:7 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Get:9 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [2,335 kB]
Get:10 http://archive.ubuntu.com/ubuntu focal-updates/restricted i386 Packages [34.2 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [25.9 kB]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo add-apt-repository -r ppa:terry.guo/gcc-arm-embedded
 tag:launchpad.net:2008:redacted
 More info: https://launchpad.net/~terry.guo/+archive/ubuntu/gcc-arm-embedded
Press [ENTER] to continue or Ctrl-c to cancel removing it.

zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get update
Ign:1 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:2 http://archive.canonical.com/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-security InRelease
Err:7 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get remove gcc-arm-none-eabi
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'gcc-arm-none-eabi' is not installed, so not removed
The following packages were automatically installed and are no longer required:
  binutils-arm-none-eabi libnewlib-arm-none-eabi libnewlib-dev
  libstdc++-arm-none-eabi-newlib
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 216 not upgraded.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt update
Ign:1 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:2 http://archive.canonical.com/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Err:8 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt install gcc-arm-none-eabi
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  gcc-arm-none-eabi
0 upgraded, 1 newly installed, 0 to remove and 216 not upgraded.
Need to get 0 B/31.6 MB of archives.
After this operation, 524 MB of additional disk space will be used.
Selecting previously unselected package gcc-arm-none-eabi.
(Reading database ... 188770 files and directories currently installed.)
Preparing to unpack .../gcc-arm-none-eabi_15%3a9-2019-q4-0ubuntu1_amd64.deb ...
Unpacking gcc-arm-none-eabi (15:9-2019-q4-0ubuntu1) ...
Setting up gcc-arm-none-eabi (15:9-2019-q4-0ubuntu1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo add-apt-repository -y ppa:paparazzi-uav/ppa

Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://archive.canonical.com/ubuntu focal InRelease
Ign:3 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Err:8 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get update
Ign:1 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-security InRelease
Err:7 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get -f -y install paparazzi-dev paparazzi-jsbsim dfu-util pprzgcs
Reading package lists... Done
Building dependency tree
Reading state information... Done
dfu-util is already the newest version (0.9-1).
paparazzi-dev is already the newest version (3.28).
paparazzi-jsbsim is already the newest version (1.7-1).
pprzgcs is already the newest version (1.0.11ubuntu3).
0 upgraded, 0 newly installed, 0 to remove and 216 not upgraded.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get install python-is-python3 gcc-arm-none-eabi gdb-multiarch
Reading package lists... Done
Building dependency tree
Reading state information... Done
python-is-python3 is already the newest version (3.8.2-4).
gcc-arm-none-eabi is already the newest version (15:9-2019-q4-0ubuntu1).
gdb-multiarch is already the newest version (9.2-0ubuntu1~20.04.1).
0 upgraded, 0 newly installed, 0 to remove and 216 not upgraded.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo add-apt-repository -y ppa:paparazzi-uav/ppa
Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Ign:6 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:7 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Err:8 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
 This PPA is an alternative to toolchain released at https://launchpad.net/gcc-arm-embedded. The source codes for both are same. Currently supports Ubuntu 10.04/12.04/14.04/14.10 32 and 64 bit.

Detailed explanations to Launchpad PPA can be found at https://help.launchpad.net/Packaging/. That website explains how a PPA is set up and how to add existing PPA and install software from it.

Here are quick steps to install toolchain from this PPA on Ubuntu before 14.04:

Step1: Inside Ubuntu, open a terminal and input
       "sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa"

Step2: Continue to input
       "sudo apt-get update"

Step3: Continue to input to install toolchain
       "sudo apt-get install gcc-arm-embedded"

To remove installed toolchain, just input "sudo apt-get remove gnu-arm-embedded".
To update the toolchain, just repeat above step2 and step3.

If it reports error message of conflict to gcc-arm-none-eabi, which is likely if upgrading from 4.x to 5+, please uninstall it first with:
       "sudo apt-get remove gcc-arm-none-eabi"

Questions should be asked at https://answers.launchpad.net/gcc-arm-embedded

Bug can be filed at https://bugs.launchpad.net/gcc-arm-embedded/+filebug. It is highly encouraged to ask question first before filing a bug.
 More info: https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.

Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Ign:2 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-security InRelease
Err:7 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get install gcc-arm-none-eabi gdb-arm-none-eabi
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gdb-arm-none-eabi
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get update
Ign:1 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:6 http://archive.canonical.com/ubuntu focal InRelease
Err:7 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo rm /etc/apt/sources.list.d/team-gcc-arm-embedded-ubuntu-ppa-focal.list
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt update
Ign:1 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:2 http://archive.canonical.com/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Err:6 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Hit:7 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt install gcc-arm-none-eabi
Reading package lists... Done
Building dependency tree
Reading state information... Done
gcc-arm-none-eabi is already the newest version (15:9-2019-q4-0ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 216 not upgraded.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo add-apt-repository -y ppa:paparazzi-uav/ppa
Ign:1 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Err:8 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get update
Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Ign:2 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:6 http://ppa.launchpad.net/paparazzi-uav/ppa/ubuntu focal InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Err:8 http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release
  404 Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/team-gcc-arm-embedded/ppa/ubuntu focal Release' does not have a Release file.
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.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$ sudo apt-get -f -y install paparazzi-dev paparazzi-jsbsim dfu-util pprzgcs
Reading package lists... Done
Building dependency tree
Reading state information... Done
dfu-util is already the newest version (0.9-1).
paparazzi-dev is already the newest version (3.28).
paparazzi-jsbsim is already the newest version (1.7-1).
pprzgcs is already the newest version (1.0.11ubuntu3).
0 upgraded, 0 newly installed, 0 to remove and 216 not upgraded.
zachary@zachary-Victus-by-HP-Gaming-Laptop-16-r0xxx:~$

The command

sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa

does not work on a Ubuntu focal system like yours.
Stop trying it again and again, it's useless.

The only thing that makes sense is removing that PPA, either with the command

sudo add-apt-repository --remove ppa:team-gcc-arm-embedded/ppa

or with

sudo rm /etc/apt/sources.list.d/team-gcc-arm-embedded-ubuntu-ppa-focal.list

Now back to your main target. You want to install paparazzi.

There is an instruction on https://paparazzi-uav.readthedocs.io/en/latest/quickstart/install.html

Please follow that instruction (Note: select the items for 20.04, not for 18.04!) and report the results.

@Manfred Hampl (m-hampl) Thank you very much. I have already solved the problem by changing the Ubuntu mirror desktop system.