Network Manager and internet not working after yum autoremove

edit

Try running this to get the LAN adapter name

 ifconfig

Look at the output

$ ifconfig
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.1  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::922b:34ff:fe98:bee7  prefixlen 64  scopeid 0x20<link>
        ether 90:2b:34:98:be:e7  txqueuelen 1000  (Ethernet)
        RX packets 77670  bytes 63551566 (60.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 64646  bytes 9453338 (9.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Then run (change adapter name to suit)

su    
ifup enp3s0

This should connect it, if it works run

su
yum groups install @gnome

You can also boot from a USB/CD Live system, if that will get you networking. (In case too many pieces of your system were lost to bring up your network.)

Once you reach the LiveCD/USB desktop, mount your system root directory — either via “Files,” on the left-hand sidebar, or via “Disks,” by locating your root partition and clicking the “Play” button.

If you need to connect to your network (eg: WiFi passwork), do so now.

Open Terminal, and enter sudo -s (+ Return). Then, dnf groups list. (If you're on an older system, use yum instead of dnf each time.) Depending on your Fedora release, you'll see one like Fedora Workstation or Gnome Desktop on the list.

In “Files,” find your system disk on the left side; you should see the top-level system folders like “boot,” “dev,” “etc,” et al on the mounted system disc. Hit Control+L to open the Location bar, and Control+C to Copy the location where it's mounted. (It probably starts with “/run/media…”)

Then, type dnf --installroot (ending with a Space), and then press Control+Shift+V to paste the location name in; then continue with (starting with another Space) groups install "Fedora Workstation", and finally Return. — Note: for older releases, replace "Fedora Workstation" with the desktop environment you'd like to use, from the list you got from dnf groups list, surrounded by " (quotation marks).

The whole, final, line might look like

dnf --installroot /run/media/users/1000/uuid-ugly-abra-cada-bra0 groups install "Fedora Workstation"

(Don't worry if it word-wraps around in Terminal, but don't hit Return until the end.)

Once dnf (or yum) finishes, you should be able to reboot (without the LiveCD) and have NetworkManager and friends back up and running.

An alternative to groups install "Fedora Workstation" (or the like) might be to just dnf --installroot /run/…/… install NetworkManager — but it's likely that other things are lost or broken, and that may not be enough to get you back operational.