Mysterious image on first boot lock screen when using Flat-Remix-Blue theme

[Eustaquio Rangel]

I'm using Ubuntu 20.04 and noticed a weird behavior. When I define the wallpaper image, ok, now is the same image for the lock screen and wallpaper, but on every first boot I get a mysterious image I don't know where is coming from. Is a beach or something. I already checked my images on home and even removed the wallpaper images from /usr, but the mysterious image is still there. Any tips how can I change it? Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.1-5ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 8 08:41:59 2020
DisplayManager: gdm3
InstallationDate: Installed on 2018-03-05 (855 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
RelatedPackageVersions: mutter-common 3.36.3-0ubuntu0.20.04.1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2020-05-09 (60 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2018-03-12T07:12:03.188751

[Sebastien Bacher (seb128)]

Thank you for your bug report, could you make a screenshot showing the issue?

[Daniel van Vugt (vanvugt)]

Or a photo of the issue?

[Eustaquio Rangel (eustaquiorangel)]

I'm running some scripts here to try to find all the images with more than 800px on all over the system. As soon as I get and check the results, I came back here with some news. :-)

[Eustaquio Rangel (eustaquiorangel)]

Guys, just noticed that *after* the first boot, if I click on the user icon on the bottom right (screenshot1.png), I also get the mysterious background (screenshot2.png) and after log in again, I get a delay (screenshot3.png).

[Eustaquio Rangel (eustaquiorangel)]

This is the image I don't know where come from.

[Eustaquio Rangel (eustaquiorangel)]

This is what happens after I log in again. Seems that is something related with user session.

[Eustaquio Rangel (eustaquiorangel)]

Found it with the help of AskUbuntu guys:

https://askubuntu.com/questions/1257334/mysterious-image-on-first-boot-lock-screen

Seems that is a "bug" on the theme I was using, not an Ubuntu one. But we can use this for reference. :-)

That beach was driving me mad! :-)