Command 'apt-get update' returned non-zero exit status 100.

[kendew]

Trying to install Sparky LXQt version 5.7 gives me a

Command 'apt-get update' returned non-zero exit status 100.

error and refers to Boost.python.  The whole dialogue goes

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Command 'apt-get update' returned non-zero exit status 100.
Get:1 http://ftp.debian.org/debian testing InRelease [117 kB] Ign:2 http://security.debian.org testing/updates InRelease Get:3 http://ftp.debian.org/debian testing/contrib Sources [44.3 kB] Err:4 http://security.debian.org testing/updates Release 404 Not Found [IP: 151.101.24.204 80] Get:5 http://ftp.debian.org/debian testing/main Sources [7879 kB] Get:6 https://sparkylinux.org/repo core InRelease [3588 B] Get:7 https://sparkylinux.org/repo testing InRelease [3594 B] Get:8 https://sparkylinux.org/repo core/main Sources [74.3 kB] Get:9 https://sparkylinux.org/repo core/main i386 Packages [77.3 kB] Get:10 https://sparkylinux.org/repo core/main amd64 Packages [81.3 kB] Get:11 http://ftp.debian.org/debian testing/non-free Sources [87.9 kB] Get:12 http://ftp.debian.org/debian testing/main i386 Packages [7889 kB] Get:13 https://sparkylinux.org/repo testing/main Sources [19.6 kB] Get:14 https://sparkylinux.org/repo testing/main i386 Packages [36.0 kB] Get:15 https://sparkylinux.org/repo testing/main amd64 Packages [37.0 kB] Get:16 http://ftp.debian.org/debian testing/main amd64 Packages [7934 kB] Get:17 http://ftp.debian.org/debian testing/main Translation-en [5994 kB] Get:18 http://ftp.debian.org/debian testing/contrib amd64 Packages [52.3 kB] Get:19 http://ftp.debian.org/debian testing/contrib i386 Packages [48.1 kB] Get:20 http://ftp.debian.org/debian testing/contrib Translation-en [45.5 kB] Get:21 http://ftp.debian.org/debian testing/non-free i386 Packages [78.2 kB] Get:22 http://ftp.debian.org/debian testing/non-free amd64 Packages [90.5 kB] Get:23 http://ftp.debian.org/debian testing/non-free Translation-en [90.4 kB] Reading package lists... E: The repository 'http://security.debian.org testing/updates Release' does not have a Release file.

Traceback:
File "/usr/lib/x86_64-linux-gnu/calamares/modules/packages/main.py", line 515, in run
    pkgman.update_db()

  File "/usr/lib/x86_64-linux-gnu/calamares/modules/packages/main.py", line 267, in update_db
    check_target_env_call(["apt-get", "update"])

  File "<string>", line 29, in <module>

To be sure, I am using an iso from a couple of months ago, pre-Buster.  Can anyone help me understand this?
Thanks
Kendew

[paxmark1]

https://sparkylinux.org/sparky-5-transition/

It is the middle of a change.  Several posts in this section "Installation & Upgrade"   mention the transition going on.  New isos are on the way. 

Sparky 4 is (was)  based on Debian Stretch which is now old stable
Sparky 5 is based on Debian Buster, which is the new stable.  Brand new. 
Sparky 6 (I believe) will be based on Debian Bullseye which is the new testing.

Read the wiki and the forums and decide.   

Note:  5.7 is based on Buster (when it was still testing)  - but your older version iso (I believe) will point to sources that are in Bullseye. If you were to use Debian testing isos that were made up a few weeks ago and attempted to install them presently, you might have had similar problems.   

[kanliot]

OP, if you have problems, just continue the install without internet, and boot into SparkyLinux.  This is a quality distro, I promise.

[kendew]

No argument about the quality distro part...I could go on and on about what I like about Sparky, but people might accuse me of getting off topic...I am amazed Sparky doesn't make it much higher on the distrowatch list. 
But reading a little as suggested, I'm having a rude awakening that Sparky testing is not as rolling as I had imagined.  It seems it's going to hit a bump every 2 years or so.  I've read at https://sparkylinux.org/sparky-5-transition/ instructions for what to do about the bump, but from my installation attempt I get the feeling it's not going to be that easy.
Maybe I should explain what I want to use Sparky for.  I'm basically installing Linux systems on computers that I will then give to non-profits or students who would have difficulty affording a new computer.  Many of these individuals will be Linux novices, at least at first, so I'm wanting something that's going to hit as few bumps as possible.  Sparky stable is perfect for old computers, but for computers that have come out in the last two years or so, a rolling release would be good, bringing new functionality and better compatibility.  I'd like new but not leading edge, so I had thought Sparky would work well for my needs.   
Anyway, I install on quite a few different kinds of computers, so my posts appear here and there on this forum.  Thanks for the support.

[paxmark1]

since you post for a variety of computers, it would help when problems arise if you would post the parts of your computer specs when problems arise.  inxi is now installed by default on Sparky now I believe. 5.8 and on.   

And for systemd journaling, I still advise to always edit every install in /etc/systemd/journald.conf   change from auto to persistent

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[Journal]
Storage=persistent