Hi Andrew, Ubuntu 14.04 Trusty was released in 2014 Apr., which is relatively old to your system (probably released in mid-2015) so it's Wifi driver and the sound card driver might not be available.
I would recommend you to give 18.04 Bionic a try, you can just test it with a LiveUSB. (Marking this bug as Incomplete base on Joseph's request in comment#2) ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1772682 Title: No sound for Dell Inspiron 5758 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1772682/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs