I just ran bleachbit for cleang, asked for password for .dstore cleaning and system hanged. So restarted. Happened this way
I tried ```
systemctl start gdm3
No command for installing gdm or light DM worksGood memory. That helps.
Ok your terminal output shows /tmp as 100% filled.
In your terminal, please run
sudo find /tmp -type f -delete
Then run
df -m /tmp
To ensure it is not filled to 100% anymore.
I am guessing from that, that the
df -m /tmp
showed /tmp as no longer filled, so you proceeded to boot?
The screenshot doesn't show anything unusual... Is it slow to boot?
Screen stuck, no login screen or reboot.
What to do ?
Boot into the Recovery Menu again and look to the list shown. Select
- dpkg
to run. That will essentially run the same command as dpkg --configure -a
- clean
This will clean up files much like we tried already. You can click that one, too just to be sure.
- fsck
This is a File System Check
Once you have run the three above, try booting normally.
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fsck does not work.
Help me how to reinstall the login screen gdm or lightdm. I think, I deleted lightdm.
Currently, this is the login screen after normal boot
wha?
That is important information.
Let's go ahead and ensure all our bases are covered...
From Recovery - to Drop to Prompt...
sudo apt install --reinstall zorin-os-lite-desktop
sudo apt install lightdm
Follow any prompts the terminal gives to setup / configure lightdm.
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Here is the output
I have lots of data on the desktop , I don't want to miss that. Please suggest such solution
I just typed startx on the terminal and this desktop came 
Ok, ensure Networking is Enabled,
then try the commands above.
No network manager or applet to open in root mode. What to do
Return to the Recovery menu
Arrow key down to Enable Networking
Once enabled, back up to the recovery menu and arrow key down to drop to prompt.
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Hi Thanks for your support. I reinstalled zorin core and also installed zorin lite desktop through command prompt. I selected gdm in the command prompt and looks good. But there are options to select zorin, xfce, zorin on Wayland, lite in the login screen. I want to keep lite only and don't want other options. What to do
Why did you install Zorin Core?
You can remove just the .desktop files for the other entries - but this would leave the Gnome D.E. and other Zorin OS Core components still installed.
The .desktop files are located in /usr/share/wayland and /usr/share/xsessions
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I tried alot for correcting the system and nothing worked. So went for fresh install of core. But system is slow , so installed lite version as per the above instructions. I don't want other desktop environments take disk space
Why not burn a Zorin Lite .iso instead and install lite? You don't have to install core to use lite.
By mistake, It happened that way .
Now want only lite not core. Help me remove core
There are previous threads about how to replace Core with Lite. e.g. How can I replace Zorin Core with Zorin Lite?
Make sure you first backup your /home partition containing personal files etc.
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