gdm3 또는 lightdm이 작동하지 않음(X11을 시작할 수 없음)

저는 데비안 9를 사용하고 있습니다. Gnome을 설치한 후 컴퓨터 화면에는 마우스 커서만 보입니다. Gnome을 제거하고 X11을 활성화했지만 작동하지 않습니다. 내가 사용하고 있는 개발 보드에 SSH를 통해 연결하고 들어가야 합니다.

> startx

화면에 이미지를 가져오려면. gnome을 설치할 때 뭔가를 망쳤을 수도 있습니다.

고쳐 쓰다:

apt install gdm작동하지 않습니다:

root@linaro-alip:~# apt install gdm
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package gdm is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is
only available from another source However the following packages replace
it:   libgdm1 cinnamon-control-center-data
E: Package 'gdm' has no installation candidate

업데이트 2:

dpkg-reconfigure lightdm>> lightdm을 수동으로 선택합니다

root@linaro-alip:~# systemctl enable lightdm

Synchronizing state of lightdm.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable lightdm
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).
This means they are not meant to be enabled using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
   .wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
   a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
   D-Bus, udev, scripted systemctl call, ...).
4) In case of template units, the unit is meant to be enabled with some
   instance name specified.

문제는 아직 해결되지 않았습니다.

다음 명령을 사용하면 파일이 존재하지 않는다고 나옵니다. 이 문제를 어떻게 해결할 수 있나요?

update-rc.d '/etc/init.d/xserver start' defaults

update-rc.d: error: initscript does not exist: /etc/init.d//etc/init.d/xserver start