Rasperry Pi stuck on login-screen / not booting
Symptoms
A Raspberry Pi with the default Rasbpian or Ubuntu Mate operating system isn't booting / is stuck on the login-screen after boot.
Related symptoms
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Details
The issue can be recognized when, after a reboot, the system doesn't automatically log in, but it stuck on the login-screen instead and asks for a password in order to login/continue, like in the example image below:
Cause
This issue might by caused by a fill disk. When the disk is full, the Raspberry doesn't boot properly anymore. Also additional services like Teamviewer, AnyDesk or VND won't be started and thefefore, the system is completely out of reach. SSH might be the only option to login onto the system remotely.
Solution / Resolution / How To
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 Login onto the Raspberry PI using SSH, for example using PuTTY.  | 
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 Use command below to check if the disk is full. If so, continue with the next step. 
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 Use the command below to find out which directory takes up the most space. 
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