I just installed GNOME DE on my Ubuntu, and I have a disgusting problem, I got rounded windows with sharp corners.
Will be grateful for any suggestions
GNOME doesn't really like the Unity theme. There are two ways to fix this. You can either switch to the default GNOME theme, or install Numix, which is sort of like a flat version of Unity.
You'll need to install the GNOME Tweak Tool first. Open a terminal and run sudo apt-get install gnome-tweak-tool
.
Use the GNOME theme
Search for "Tweak Tool" and open it.
Go to the Appearance tab. Change the "Window", "GTK+" and "Icons" dropdowns to "Adwaita". Relog or reboot and your theme should be GNOME's default. (No more theme issues)
Install Numix
Open a terminal and run
sudo add-apt-repository ppa:numix/ppa
sudo apt-get update
sudo apt-get install numix-gtk-theme numix-icon-theme-circle
Open Tweak Tool.
In the same fields as above, select Numix instead of Adwaita. Relog or reboot to make sure the theme applies fully.
Hopefully, you won't have those corner issues again.