I had the same problem and a new Fedora solved this for me. On the other
hand, I am experiencing some problems with wifi now...
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https://bugs.launchpad.net/bugs/1821533
Title:
drm fails
I had the same problem. The usb modem was detected as CD-ROM. I had to install
driver manually and now the modem works fine. See
https://askubuntu.com/questions/790490/ubuntu-16-04-usb-modem-detected-as-cd-rom-unable-to-connect
Hope it helps.
Jiri Krticka
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