In cosmic the behavior changes.
1. By default gnome-terminal is always opaque.
2. If you set Use transparency background, check/uncheck "Use the transparency
from system theme will not affect anything at all.
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Desktop Bugs,
On 18.04 if you change setting it will result in a stable transparent
background:
1. Uncheck "Use transparency from system theme"
2. "Check Use tranparent background"
3. Re-check "Use transparency from system theme"
Also reported at bug #1726262
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Also on Ubuntu 18.04 i7-4790 with Intel Integrated Graphic Card.
I think this is not related to graphic card.
If you still want to use transparency from system theme, you can try
following:
1. Uncheck "Use transparency from system theme"
2. "Check Use tranparent background"
3. Re-check "Use tran