我正在旧台式电脑上安装 Lubuntu，混合了 64 位和 32 位架构。我在 64 位电脑上安装了 Lubuntu 20.04，喜欢它的 UI，希望在 32 位电脑上也能有同样的 UI，因为只有 18.04 可以安装。由于 Lubuntu 从 18.10 开始放弃了 LXCE 而改用 lxqt，我想我需要安装 lxqt。但我无法对 UI 进行任何更改：lightDM GTK+ Greeter 程序据称允许更改主题和图标，但任何可能的选择，无论是与 Lubuntu 一起安装的还是我安装的其他，都没有显示出来，它始终保持默认主题和图标。以下是命令lightdm --show-config显示的内容：
[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