Ubuntu 18.04 stuck on verbose screen on startup

I had done a sudo apt-get upgrade and was installing some packages(truffle,nodejs) when my laptop stopped responding and applications were not opening so I restarted it and when it booted it got stuck in the verbose boot screen and blinking intermittently.
All were showing [OK] so I pressed ALT + F2 and was able to login but it showed a few python value errors in file “/usr/lib/python3/dist-packages/lsb_release.py” ValueError: could not convert string to float: '6.06 LTS'
How can I fix this and complete the boot sequence please help?

screen flickering, turning off, 18.10 Intel

I recently moved my work computer home and hooked it to new monitors. One monitor works perfectly, the other (an AOC monitor connected via displayport) flickers and tears occasionally, and then will put itself to sleep and I have to disconnect/reconnect it to the computer to wake it up.

I never had this problem previously with other Dell monitors at the office. I had the problem with 18.04 so tried updating to 18.10 and the problem persists. I’ve also tried changing the refresh rate to no avail.

This is the output of xrandr:

Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192 HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm    1920x1080     63.69*+  60.00    60.00    50.00    59.94    24.00    23.98      1920x1080i    60.00    60.00    50.00    59.94      1680x1050     59.88      1600x900      60.00      1280x1024     75.02    60.02      1280x960      60.00      1280x800      59.91      1280x720      60.00    60.00    50.00    59.94      1024x768      75.03    70.07    60.00      800x600       72.19    75.00    60.32    56.25      720x576       50.00    50.00      720x576i      50.00    50.00      720x480       60.00    60.00    59.94    59.94    59.94      720x480i      60.00    60.00    59.94    59.94      640x480       75.00    72.81    66.67    60.00    59.94    59.94      720x400       70.08   DP-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 509mm x 286mm    1920x1080     60.00*+  60.00    50.00    59.94      1920x1080i    60.00    50.00    59.94      1680x1050     59.95      1280x1024     75.02    60.02      1440x900      59.89      1280x960      60.00      1280x720      60.00    60.00    50.00    59.94      1024x768      75.03    70.07    60.00      832x624       74.55      800x600       72.19    75.00    60.32    56.25      720x576       50.00    50.00    50.00      720x480       60.00    60.00    59.94    59.94    59.94      640x480       75.00    72.81    66.67    60.00    59.94    59.94      720x400       70.08    HDMI-2 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) HDMI-3 disconnected (normal left inverted right x axis y axis) DP-3 disconnected (normal left inverted right x axis y axis) 

And calling lspci | grep VGA gives:

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06) 

I’m stumped. Any suggestions welcome.

On Boot up, Lightdm does not work and black screen appears

I updated ubuntu 16.04 LTS to ubuntu 18.04 LTS. On ubuntu 16.04 I was using gdm3, which got broken during upgrading because when I set gdm3 as default display manager in recovery mode through,

sudo dpkg-reconfigure gdm3 

it said “gdm3 is broken or not properly installed” so I set lightdm as default display manager.

Now, when I boot having lightdm, after the purple scree, the black screen appears and nothing happens. If I press Ctrl+Alt+F2 , it shows me the tty3 login screen. I login with my username and password. Sometimes, it accepts it and sometimes it doesn’t (which is an issue but not the major issue of this question).

After logging in, I can navigate my directories but I can’t open graphical window. I tried opening chromium using command “chromium-browser www.google.com” but it said something like “Graphical interface not permitted”.

How do I get my Graphical Interface back? Note that I can’t connect to wifi. I tried using

sudo ifconfig wlan0 up sudo iwconfig wlan0 essid name key s:password 

It gave error in setting password which was like “Invalid argument password, Set encode”. I tried giving hexadecimal password too without s:

sudo iwconfig wlan0 essid name key hexpassword 

Didn’t work either. How do I get my UI back? And can the internet be connected through ethernet?

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amdgpu screen tearing

I install Ubuntu 18.04 with the amdgpu driver for my rx580 and I’m continuing to get screen tearing occasionally with windows and during video playback. I’ve enabled TearFree, DRI3, and a couple others in my xorg.conf.d file but none seems to have any effect.

here is my current config

Section "Device"     Identifier "Card0"     Driver "amdgpu"     BusID "PCI:1:0:0"     Option "DRI3" "3"     Option "AccelMethod" "glamor"     Option "TearFree" "true"     Option "VariableRefresh" "true" EndSection  

I’ve fixed this on other linux machines using compton but to my knowledge I’m not able to change the compositor used by gnome. Not sure what the next step is to trouble shoot this issue.

Ubuntu showing black screen while working

When I’m working with Ubuntu and doing my usual work, suddenly I see a black screen. I can hit ctrl+alt+F1 and GNOME login appears. So I can Login again and come back to the session with all windows opened.

This problem happened to me about 10 times in 2 months. This is my log when the problem happened:

 2:35:26 AM gnome-logs: Failed to load module "unity-gtk-module"  2:35:26 AM dbus-daemon: [session uid=1000 pid=2791] Successfully activated service 'org.gnome.Logs'  2:34:46 AM gnome-shell: Window manager warning: Overwriting existing binding of keysym ffe1 with keysym ffe1 (keycode 32).  2:34:44 AM dbus-daemon: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.216' (uid=1000 pid=22053 comm="/opt/google/chrome/chrome     " label="unconfined")  2:34:38 AM gdm-x-session: (II) event3  - Microsoft Microsoft® Wireless Laser Mouse 8000: device is a pointer  2:34:38 AM kernel: rfkill: input handler disabled  2:34:38 AM acpid: 1 client rule loaded  2:34:38 AM gdm-x-session: (II) NVIDIA(0): Setting mode "DFP-0:nvidia-auto-select"  2:34:38 AM gnome-shell: clutter_input_device_get_device_id: assertion 'CLUTTER_IS_INPUT_DEVICE (device)' failed  2:34:38 AM gdm-x-session: (II) event2  - Microsoft Microsoft® Wireless Entertainment Keyboard 7000: device removed  2:34:38 AM gdm-session-wor: gkr-pam: unlocked login keyring  2:34:30 AM gdm-x-session: (II) event1  - Power Button: device is a keyboard  2:34:30 AM acpid: 1 client rule loaded  2:34:30 AM gdm-x-session: (II) NVIDIA(0): Setting mode "DFP-0:nvidia-auto-select"  2:34:27 AM gnome-shell: g_array_unref: assertion 'array' failed  2:34:27 AM gdm-x-session: (II) systemd-logind: got pause for 13:67  2:34:27 AM kernel: rfkill: input handler enabled  2:34:26 AM acpid: client 2785[0:0] has disconnected  2:34:26 AM gdm-x-session: (II) event2  - Microsoft Microsoft® Wireless Entertainment Keyboard 7000: device removed 

I’m using Ubuntu 18.04.2, GNOME Shell 3.28.4 and Nvidia 390.116 driver.

I didn’t remove the Keyboard which I see on log. RAM and CPU usage are normal.

What is going wrong?