Comment # 19 on bug 1176304 from 
Strange.  Installed mine on real hardware (brave as I am) from Network Image
(via https://software.opensuse.org/distributions/testing) burnt to CD.  Image
downloaded 2020-12-16, installed 2020-12-17.

Was running into issues: linuxrc was complaining that in order to use the
selected repository a matching boot image is needed.  I confirmed to download
and install.

After this, the repo path was lost and I had to type it in manually (used
https://download.opensuse.org/distribution/leap/15.3/repo/oss).

After successful installation, the system got stuck when trying to reboot.

Here is my repo list:
.....................................................................
linux:/home/chris # zypper lr --uri
Repository priorities are without effect. All enabled repositories share the
same priority.

# | Alias                     | Name                               | Enabled |
GPG Check | Refresh | URI
--+---------------------------+------------------------------------+---------+-----------+---------+-------------------------------------------------------------------------
1 | openSUSE-Leap-15.3-1      | openSUSE-Leap-15.3-1               | Yes     |
(r ) Yes  | Yes     |
https://download.opensuse.org/distribution/leap/15.3/repo/oss
2 | repo-debug                | Debug Repository                   | No      |
----      | ----    |
https://download.opensuse.org/debug/distribution/leap/15.3/repo/oss/
3 | repo-debug-non-oss        | Debug Repository (Non-OSS)         | No      |
----      | ----    |
https://download.opensuse.org/debug/distribution/leap/15.3/repo/non-oss/
4 | repo-debug-update-non-oss | Update Repository (Debug, Non-OSS) | No      |
----      | ----    |
https://download.opensuse.org/debug/update/leap/15.3/non-oss/
5 | repo-non-oss              | Non-OSS Repository                 | Yes     |
(r ) Yes  | Yes     |
https://download.opensuse.org/distribution/leap/15.3/repo/non-oss/
6 | repo-oss                  | Main Repository                    | Yes     |
(r ) Yes  | Yes     |
https://download.opensuse.org/distribution/leap/15.3/repo/oss/
7 | repo-source               | Source Repository                  | No      |
----      | ----    |
https://download.opensuse.org/source/distribution/leap/15.3/repo/oss/
8 | repo-update               | Main Update Repository             | Yes     |
(r ) Yes  | Yes     | https://download.opensuse.org/update/leap/15.3/oss
9 | repo-update-non-oss       | Update Repository (Non-Oss)        | Yes     |
( p) Yes  | Yes     | https://download.opensuse.org/update/leap/15.3/non-oss/
.....................................................................

Online content of https://download.opensuse.org/update/leap/15.3/non-oss/ is
empty, thus zypper complains about invalid repo (see also below's zypper
output).

Mentioned package listed above when fixing this for 15.2:
.....................................................................
linux:/home/chris # zypper if gnome-shell
Retrieving repository 'Update Repository (Non-Oss)' metadata
..........................................................................................................................................................................[error]
Repository 'Update Repository (Non-Oss)' is invalid.
[repo-update-non-oss|https://download.opensuse.org/update/leap/15.3/non-oss/]
Valid metadata not found at specified URL
History:
 -
[repo-update-non-oss|https://download.opensuse.org/update/leap/15.3/non-oss/]
Repository type can't be determined.

Please check if the URIs defined for this repository are pointing to a valid
repository.
Warning: Skipping repository 'Update Repository (Non-Oss)' because of the above
error.
Some of the repositories have not been refreshed because of an error.
Loading repository data...
Reading installed packages...


Information for package gnome-shell:
------------------------------------
Repository     : openSUSE-Leap-15.3-1
Name           : gnome-shell
Version        : 3.34.4+4-1.58
Arch           : x86_64
Vendor         : SUSE LLC <https://www.suse.com/>
Installed Size : 4.6 MiB
Installed      : Yes (automatically)
Status         : up-to-date
Source package : gnome-shell-3.34.4+4-1.58.src
Summary        : GNOME Shell
Description    : 
    The GNOME Shell redefines user interactions with the GNOME desktop. In
    particular, it offers new paradigms for launching applications, accessing
    documents, and organizing open windows in GNOME.

linux:/home/chris # cat /etc/os-release 
NAME="openSUSE Leap"
VERSION="15.3 Alpha"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="15.3"
PRETTY_NAME="openSUSE Leap 15.3 Alpha"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:15.3"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"

linux:/home/chris # zypper if branding-openSUSE branding-upstream 
Retrieving repository 'Update Repository (Non-Oss)' metadata
..........................................................................................................................................................................[error]
Repository 'Update Repository (Non-Oss)' is invalid.
[repo-update-non-oss|https://download.opensuse.org/update/leap/15.3/non-oss/]
Valid metadata not found at specified URL
History:
 -
[repo-update-non-oss|https://download.opensuse.org/update/leap/15.3/non-oss/]
Repository type can't be determined.

Please check if the URIs defined for this repository are pointing to a valid
repository.
Warning: Skipping repository 'Update Repository (Non-Oss)' because of the above
error.
Some of the repositories have not been refreshed because of an error.
Loading repository data...
Reading installed packages...


Information for package branding-openSUSE:
------------------------------------------
Repository     : openSUSE-Leap-15.3-1
Name           : branding-openSUSE
Version        : 15.2.20200203-lp153.1.1
Arch           : noarch
Vendor         : openSUSE
Installed Size : 1.6 KiB
Installed      : Yes (automatically)
Status         : up-to-date
Source package : branding-openSUSE-15.2.20200203-lp153.1.1.src
Summary        : openSUSE Leap 15.2 Brand File
Description    : 
    This package contains the file /etc/SUSE-brand, and its name is used as
    a trigger for installation of correct vendor brand packages.


Information for package branding-upstream:
------------------------------------------
Repository     : openSUSE-Leap-15.3-1
Name           : branding-upstream
Version        : 12.3-lp153.1.1
Arch           : noarch
Vendor         : openSUSE
Installed Size : 1.1 KiB
Installed      : No
Status         : not installed
Source package : branding-upstream-12.3-lp153.1.1.src
Summary        : SUSE Brand File Supplementing Upstream Look and Feel
Description    : 
    This package contains the file /etc/SUSE-brand, and its name is used as
    a trigger for installation of look and feel and branding of packages as
    it was defined by upstream developers.

    WARNING: If you decide to install this package instead of the default
    branding package, you will lose vendor customization of your
    distribution.


linux:/home/chris # cat /etc/SUSE-brand 
openSUSE
VERSION = 15.2
.....................................................................

Was trying netinst image as of today to install under Gnome Boxes.
Received the same message (in order to use the selected repository a matching
boot image is needed).  No asking for repo afterwards, but instead the error
message "Installation system does not match your boot medium" popped up.

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