смоделировал на стационарнике (см. скрины)
всплывающее окно может появляться как на области рабочего стола в произвольном месте, так и на панели (закономерностей не понял)
пакет dconf-editor-3.24.3-alt0.M80P.1 по умолчанию в Simply не ставится. Установил, запустил, посмотрел - все равно ничего похожего не вижу
dconf dump /
[org/gnome/mines]
window-width=690
theme='classic'
mode=1
use-animations=true
window-is-maximized=false
window-height=516
[org/gnome/chess]
width=700
maximized=false
height=550
last-played-as='white'
[org/gnome/mahjongg]
window-height=599
window-width=900
window-is-maximized=true
[org/gnome/desktop/wm/keybindings]
move-to-side-n=['disabled']
maximize=['<Super>Up']
move-to-corner-ne=['disabled']
switch-windows-backward=['disabled']
move-to-side-s=['disabled']
toggle-shaded=['disabled']
move-to-workspace-up=['<Shift><Super>Prior']
toggle-maximized=['<Alt>F10']
move-to-side-w=['disabled']
move-to-workspace-1=['<Shift><Super>Home']
move-to-corner-se=['disabled']
panel-main-menu=['<Super>s']
switch-to-workspace-down=['<Super>Next']
switch-to-workspace-1=['<Super>Home']
move-to-corner-nw=['disabled']
unmaximize=['<Super>Down']
move-to-side-e=['disabled']
switch-windows=['disabled']
move-to-workspace-down=['<Shift><Super>Next']
switch-to-workspace-up=['<Super>Prior']
move-to-corner-sw=['disabled']
minimize=['<Super>h']
[org/gtk/settings/file-chooser]
sort-column='name'
sidebar-width=151
window-position=(74, 77)
show-size-column=true
show-hidden=false
window-size=(1124, 822)
sort-directories-first=false
date-format='regular'
sort-order='ascending'
location-mode='path-bar'
[org/compiz]
existing-profiles=['Default', 'mate']
current-profile='mate'
[org/compiz/profiles/mate]
plugins-with-set-keys=['titleinfo', 'decor', 'composite', 'vpswitch', 'mag', 'animationsim', 'fadedesktop', 'shelf', 'crashhandler', 'snap', 'gnomecompat', 'animation', 'td', 'neg', 'trailfocus', 'rotate', 'widget', 'bench', 'notification', 'winrules', 'water', 'freewins', 'mousepoll', 'staticswitcher', 'maximumize', 'screenshot', 'mblur', 'ezoom', 'opengl', 'showrepaint', 'expo', 'resize', 'animationjc', 'workspacenames', 'obs', 'workarounds', 'switcher', 'shift', 'animationaddon', 'imgjpeg', 'ring', 'commands', 'cube', 'firepaint', 'scale', 'scalefilter', 'put', 'clone', 'wall', 'thumbnail', 'core', 'resizeinfo', 'place', 'kdecompat', 'opacify', 'fade', 'wobbly', 'grid', 'session', 'showmouse', 'blur', 'move', 'animationplus', 'annotate', 'showdesktop', 'splash', 'wallpaper', 'wizard', 'matecompat', 'scaleaddon', 'cubeaddon', 'extrawm', 'addhelper']
[org/compiz/profiles/mate/plugins/animationaddon]
fire-color='#ff3305ff'
beam-color='#7f7f7fff'
[org/compiz/profiles/mate/plugins/resizeinfo]
gradient-1='#cccce6cc'
gradient-2='#f3f3f3cc'
gradient-3='#d9d9d9cc'
outline-color='#e6e6e6ff'
[org/compiz/profiles/mate/plugins/ezoom]
zoom-box-fill-color='#2f2f2f4f'
zoom-box-outline-color='#2f2f4f9f'
[org/compiz/profiles/mate/plugins/cubeaddon]
ground-color1='#b3b3b3cc'
ground-color2='#b3b3b300'
[org/compiz/profiles/mate/plugins/animationplus]
bonanza-color='#ff3305ff'
[org/compiz/profiles/mate/plugins/thumbnail]
thumb-color='#0000007f'
font-background-color='#0000007f'
[org/compiz/profiles/mate/plugins/wall]
thumb-highlight-gradient-shadow-color='#dfdfdfff'
arrow-base-color='#e6e6e6d9'
arrow-shadow-color='#dcdcdcd9'
[org/compiz/profiles/mate/plugins/animation]
close-matches=['((type=Normal | Unknown) | name=sun-awt-X11-XFramePeer | name=sun-awt-X11-XDialogPeer) & !(role=toolTipTip | role=qtooltip_label) & !(type=Normal & override_redirect=1) & !(name=gnome-screensaver) & !(name=gnome-screenshot)', '((type=Menu | PopupMenu | DropdownMenu | Combo | Dialog | ModalDialog | Normal) & !(class=\\.exe$))', '(type=Tooltip | Notification | Utility) & !(name=compiz) & !(title=notify-osd)']
open-matches=['((type=Normal | Unknown) | name=sun-awt-X11-XFramePeer | name=sun-awt-X11-XDialogPeer) & !(role=toolTipTip | role=qtooltip_label) & !(type=Normal & override_redirect=1) & !(name=gnome-screensaver)', '((type=Menu | PopupMenu | DropdownMenu | Combo | Dialog | ModalDialog | Normal) & !(class=\\.exe$))', '(type=Tooltip | Notification | Utility) & !(name=compiz) & !(title=notify-osd)']
[org/compiz/profiles/mate/plugins/freewins]
cross-line-color='#1800ffff'
snap-threshold=50
circle-color='#54befb80'
line-color='#1800ffff'
[org/compiz/profiles/mate/plugins/switcher]
background-color='#333333d9'
[org/compiz/profiles/mate/plugins/screenshot]
selection-outline-color='#2f2f4f9f'
selection-fill-color='#2f2f4f4f'
[org/compiz/profiles/mate/plugins/expo]
ground-color1='#b3b3b3cc'
ground-color2='#b3b3b300'
[org/compiz/profiles/mate/plugins/decor]
active-shadow-color='#00000080'
command='gtk-window-decorator --replace'
inactive-shadow-color='#000000ff'
[org/compiz/profiles/mate/plugins/staticswitcher]
background-color='#333333d9'
[org/compiz/profiles/mate/plugins/firepaint]
fire-color='#ff3305ff'
[org/compiz/profiles/mate/plugins/core]
active-plugins=['core', 'composite', 'opengl', 'compiztoolbox', 'copytex', 'decor', 'resize', 'switcher', 'imgpng', 'wall', 'wobbly', 'session', 'move', 'matecompat', 'scale']
[org/compiz/profiles/mate/plugins/shift]
ground-color1='#b3b3b3cc'
ground-color2='#b3b3b300'
[org/compiz/profiles/mate/plugins/showmouse]
color='#ffdf3fff'
[org/mate/atril/default]
window-ratio=(2.150465374147374, 1.1484560570071258)
[apps/light-locker]
late-locking=false
lock-after-screensaver=uint32 5
lock-on-suspend=true
idle-hint=false
lock-on-lid=false
[ca/desrt/dconf-editor]
saved-view='/'
window-height=600
window-width=800
window-is-maximized=false
тоже вроде как ничего похожего ...
проблема конечно некритично-косметического характера, но хотелость бы понять причину и способ ее устранения