UBUNTU's Network Connection Manger can't detect Huawei ETS2051 Modem device!
Solution 1:
I found the solution for this, you can simply stop the Network Manger and everything will run great including Ubuntu Software Center! stop it by run this commend in the terminal:
sudo stop network-manager
you can bring it back by restart your computer or simply run this:
sudo start network-manager
that's it how easy fix, but hard to get the right answer nowadays!