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Trouble upgrading Debian

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Hello,

today, i started to upgrade my computer from Debian 9 (Stretch) to
Debian 11 (Bullseye). I had some trouble finding what i wanted to do, a
completely internet based upgrade, if possible. In the Debian
documention, i did not find this explanation. It says it can be done,
but it does not explain how to do it.

So, i opened the following thread. Do not read it now, there are more
things i will say here, first.

https://www.linuxquestions.org/questions/linux-software-2/upgrading-debian-distribution-4175700202/#post6281677

In the thread, I was advised to not upgrade from Debian 9 to 11 in one
step, because "jumping 2 releases will probably result in MASSIVE
breakage". This should be in the official documentation, no? If there is
this risk, it must be.

So, i should to 2 upgrades: one to Debian 10, and one more to Debian 11.
Fine. And for each one, the steps are:

1. Disable all third party repositories.

2. Edit /etc/apt/sources.list to reflect the next distribution i will
have. Directly, this is just changing all "stretch" occurencies to
"buster"; or all "buster" to "bullseye", in the second upgrade.

3. apt update

4. apt upgrade

5. apt full-upgrade

But after my first edition to sources.list, apt update fails. I have
tried apt-get update to, but it also fails for the apparently same reason.

What should i do to solve this?

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Thread

Trouble upgrading Debian Dedeco Balaco <dedeco.balaco@yahoo.com> - 2021-09-05 06:30 +0200
  Re: Trouble upgrading Debian piorunz <piorunz@gmx.com> - 2021-09-06 00:20 +0200
    Re: Trouble upgrading Debian <tomas@tuxteam.de> - 2021-09-06 08:20 +0200
    Re: Trouble upgrading Debian piorunz <piorunz@gmx.com> - 2021-09-06 18:40 +0200
  Re: Trouble upgrading Debian (reply to David Wright) Dedeco Balaco <dedeco.balaco@yahoo.com> - 2021-09-06 03:30 +0200
    Re: Trouble upgrading Debian (reply to David Wright) Richard Hector <richard@walnut.gen.nz> - 2021-09-06 10:50 +0200
    Re: Trouble upgrading Debian (reply to David Wright) Curt <curty@free.fr> - 2021-09-06 16:10 +0200
      Re: Trouble upgrading Debian (reply to David Wright) John Hasler <john@sugarbit.com> - 2021-09-06 19:30 +0200
        (HTML) Re: Trouble upgrading Debian (reply to David Wright) Dedeco Balaco <dedeco.balaco@yahoo.com> - 2021-09-06 21:50 +0200
          Re: (HTML) Re: Trouble upgrading Debian (reply to David Wright) Kenneth Parker <sea7kenp@gmail.com> - 2021-09-07 04:40 +0200
          Re: (HTML) Re: Trouble upgrading Debian (reply to David Wright) Andrei POPESCU <andreimpopescu@gmail.com> - 2021-09-12 10:00 +0200
        Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) Dan Ritter <dsr@randomstring.org> - 2021-09-06 23:00 +0200
          Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) piorunz <piorunz@gmx.com> - 2021-09-07 01:20 +0200
        Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) Greg Wooledge <greg@wooledge.org> - 2021-09-07 02:00 +0200
          Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) Kenneth Parker <sea7kenp@gmail.com> - 2021-09-07 04:50 +0200
            Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) "Andrew M.A. Cater" <amacater@einval.com> - 2021-09-07 08:30 +0200
            Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) Greg Wooledge <greg@wooledge.org> - 2021-09-07 13:10 +0200
            Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) David Wright <deblis@lionunicorn.co.uk> - 2021-09-07 17:10 +0200
        Re: Trouble upgrading Debian (reply to David Wright) Richard Hector <richard@walnut.gen.nz> - 2021-09-08 03:00 +0200
        Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) Thomas Amm <debili@open-email.net> - 2021-09-13 23:00 +0200
          Re: (pure text) Re: Trouble upgrading Debian (reply to David Wright) <tomas@tuxteam.de> - 2021-09-14 08:10 +0200

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