Public bug reported:

Ubuntu 18.04.01 
I updated my system from 16.04 to 18.04 and after that I am repeatedly facing 
some system bugs. 1) I turn on laptop and it shows me start page where i need 
login by my user name, i enter password it start proceed but after that it 
again shows start page, i again enter password and it than hangs at all. I turn 
off and turn on by manually hold power bottom. But in-vain this happens again 
and again atlest 4- 5 times. then it works. 2) Many times as happens that it 
goes sleep mode and after few min it does not work and black screen. also some 
times i click power off it closes all apps shows Ubuntu logo and than hangs. 
Also some times it showed me strange power off bottom and lines during start 
(pictures enclosed) 
i use Dell-Inspiron-5567 Intel® Core™ i7-7500U CPU @ 2.70GHz × 4 Intel® HD 
Graphics 620 (Kaby Lake GT2) os 64-bit

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Screen.pdf"
   https://bugs.launchpad.net/bugs/1790097/+attachment/5182935/+files/Screen.pdf

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https://bugs.launchpad.net/bugs/1790097

Title:
  Does not return from sleep mode. Hangs during turning off. Cannot log
  in in user account, system hangs

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