CTRL+ALT+T not working

Solution 1:

This is a bug of Gnome Shell. The default shortcut will not work. But a new shortcut will work as usual.

Go to Keyboard > Shortcuts > Custom Shortcuts. Click on + to add a new shortcut,

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At the place of Name use Gnome terminal. In place of Command use the following string,

gnome-terminal --profile=Default --geometry=95x35+250+60

Now assign the key combination (Ctrl+Alt+T) on clicking on it. Afterwards the shortcut should work.