Ubuntu 17.10 GNOME Shell Theme Color Sometimes Blue

Question

Not sure what's going on here. Sometimes when I boot up my (color theme?) is blue instead of the default orange. Other times its the normal orange.

I hate the orange and would like to make it always be blue and would also like to make my laptop always blue as well. Also my login screen on my desktop is still the old login screen and my laptop is the new one. No clue whats going on with my desktop and I can't get it figured out. I have no shell themes installed.

Ubuntu 17.10
GNOME Shell: 3.26.1

Current settings in tweaks/Appearance
Applications: Adwaita-dark
Cursor: DMZ-White
Icons: Ubuntu-mono-dark
Shell: (None) Default

Answer 1

It seems you're (inadvertently) switching between the (vanilla) "GNOME" session and the modified GNOME session titled "Ubuntu" ("Ubuntu" is orange, "GNOME" is blue).

You may load the "bluish" GNOME shell theme from your home directory. To do that follow the steps below.

1. Create a directory, say MyTheme either in ~/.themes or in ~/.local/share/themes. (You may create ~/.themes or ~/.local/share/themes if they don't exist.)
2. Create another directory inside MyTheme called gnome-shell.
3. Create an empty document in this gnome-shell directory and name it gnome-shell.css.

4. Open this gnome-shell.css in a text editor and add the following line

   @import url("/usr/share/gnome-shell/theme/gnome-shell.css");  
   

5. Install and activate the User themes extension from here.

6. Launch Tweaks, go to Appearance section and click on the drop-down box next to "Shell theme". MyTheme should appear in the drop-down list. Select it.

Answer 2

I am new to Ubuntu... Reseting Gnome shell may help. Type the command below

dconf reset -f /org/gnome/

you would need to re-configure your UI settings. At your own risk.