Nenhuma alteração possível no LightDM GTK + para Lubuntu 18.04

Nenhuma alteração possível no LightDM GTK + para Lubuntu 18.04

Estou instalando o Lubuntu em desktops antigos, uma mistura de arquiteturas de 64 e 32 bits. Instalei o Lubuntu 20.04 nos PCs de 64 bits e gostei da UI, e gostaria do mesmo em 32 bits onde apenas o 18.04 pode ser instalado. Como o Lubuntu abandonou o LXCE desde 18.10 para o lxqt, acho que preciso instalar o lxqt. Mas não posso fazer nenhuma alteração na UI: o programa lightDM GTK+ Greeter supostamente permite alterar o tema e os ícones, mas nenhuma das opções possíveis, sejam as instaladas com o Lubuntu ou outras que instalei, aparece, permanece sempre com o tema padrão e ícone. Aqui está o que o lightdm --show-configcomando mostra:

   [Seat:*]
I  user-session=Lubuntu
J  allow-guest=false
L  greeter-wrapper=/usr/lib/lightdm/lightdm-greeter-session
M  guest-wrapper=/usr/lib/lightdm/lightdm-guest-session
N  xserver-command=X -core
P  greeter-session=kylin-greeter
Q  autologin-guest=false
Q  autologin-user=aic1
Q  autologin-user-timeout=0

   [LightDM]
K  backup-logs=false

Sources:
I  /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
J  /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
K  /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
L  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
M  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
N  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
O  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
P  /usr/share/lightdm/lightdm.conf.d/95-kylin-greeter.conf
I  /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
J  /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
K  /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
L  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
M  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
N  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
O  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
P  /usr/share/lightdm/lightdm.conf.d/95-kylin-greeter.conf

lightdm --show-config
  [Seat:*]
I  user-session=Lubuntu
J  allow-guest=false
L  greeter-wrapper=/usr/lib/lightdm/lightdm-greeter-session
M  guest-wrapper=/usr/lib/lightdm/lightdm-guest-session
N  xserver-command=X -core
P  greeter-session=kylin-greeter
Q  autologin-guest=false
Q  autologin-user=aic1
Q  autologin-user-timeout=0

  [LightDM]
K  backup-logs=false

Sources:
I  /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
J  /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
K  /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
L  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
M  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
N  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
O  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
P  /usr/share/lightdm/lightdm.conf.d/95-kylin-greeter.conf
I  /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
J  /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
K  /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
L  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
M  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
N  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
O  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
P  /usr/share/lightdm/lightdm.conf.d/95-kylin-greeter.conf


lightdm --show-config
 [Seat:*]
I  user-session=Lubuntu
J  allow-guest=false
L  greeter-wrapper=/usr/lib/lightdm/lightdm-greeter-session
M  guest-wrapper=/usr/lib/lightdm/lightdm-guest-session
N  xserver-command=X -core
P  greeter-session=kylin-greeter
Q  autologin-guest=false
Q  autologin-user=aic1
Q  autologin-user-timeout=0

 [LightDM]
K  backup-logs=false

Sources:
I  /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
J  /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
K  /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
L  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
M  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
N  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
O  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
P  /usr/share/lightdm/lightdm.conf.d/95-kylin-greeter.conf
I  /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
J  /usr/share/lightdm/lightdm.conf.d/50-disable-guest.conf
K  /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
L  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
M  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
N  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
O  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
P  /usr/share/lightdm/lightdm.conf.d/95-kylin-greeter.conf

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