Cannot access gnome-desktop

[Haefler1985]

Your system information

• Steam client version: 1516948201
• SteamOS version: latest release
• Opted into Steam client beta?: Yes
• Opted into SteamOS beta?: I don't think but I use apt-get update/upgrade/dist-upgrade from gnome-terminal
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

I have been using gnome-desktop for some months to use playonlinux and lutris. I did a update of all packages yesterday before turning off my steam machine (maybe this is the reason for the problem). Today I tried to enter gnome desktop via the power-off-button (as always). It does not do anything. So I went to gnome-terminal with Ctrl + Alt + F2 and logged in. After logging in I tried to start startx but I only got a blue screen without any buttons. Maybe something broken with xwindow or nvida driver?

Steps for reproducing this issue:

1. Activate the access to gnome-desktop in Settings
2. Access gnome-desktop via power-off-button -> does not work
3. Access gnome-terminal via Ctrl + Alt + F2
4. Start sudo startx -> only blue screen

[Haefler1985]

Attached you find the last upgraded and installed packages. I think not starting gnome desktop again evolved when installing the latest wine versions.

latest install.pdf latest upgrade.pdf