I get this red sign on top saying that I must update manually due to network problems. When I click on show updates I get the software on this computer is up to date and I click ok, but the red sign will not go away. When I restart the computer it is gone but reappears in a few minutes. How can I remove this red warning?
There is a number of alternative ways you can follow to solve constantly appearing Ubuntu update sign.
The next 2 methods I do not recommend and put them only for comparison: