[Bug 1879373] [NEW] Pre-released updates ON by default

Mon May 18 20:06:38 UTC 2020

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When installing a fresh Ubuntu 20.04 from an USB Stick, then in the "Software & Updates" settings window, where there is a possibility to set up software sources, on the "Developer Options" tab the "Pre-released updates (focal-proposed)" checkbox is ON by default, therefore installing pre-release packages for regular users as well.
And not just when booting from the installation media (USB stick), but after installing the system onto the main HDD / SSD , the situation is the same.

The issue popped up when I already had gnome-shell 3.36.2 on my system
(completely killing gnome-tweaks), while the latest stable release was
just 3.36.1

Thanks to #ubuntu IRC channel and especially "ioria" user to help me
figuring out what is going on.

The installation ISO image I was used has the signature from 3rd May.

$cat /var/log/installer/media-info 
Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200503)
$lsb_release -rd
Description:    Ubuntu 20.04 LTS
Release:        20.04
$uname -a
Linux sarmx777 5.4.0-31-generic #35-Ubuntu SMP Thu May 7 20:20:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
$

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon May 18 20:06:44 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
InstallationDate: Installed on 2020-05-11 (7 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200503)
SourcePackage: ubiquity
Symptom: installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug focal ubiquity-20.04.15
-- 
Pre-released updates ON by default
https://bugs.launchpad.net/bugs/1879373
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