Wireguard ceased to work after Fedora 26->27 upgrade

[Germano Massullo]

jdoss helped me in #wireguard IRC channel. I post the resolution, it
could be useful for other Fedora users

[18:28] <jdoss> sudo dnf remove wireguard-dkms wireguard-tools; sudo dnf
install wireguard-dkms wireguard-tools
[18:31] <me> jdoss: dnf cannot remove wireguard-dkms, output below

=============
Transazione in corso
  Preparazione in corso                     
:                                                                                                                  
1/1
  Esecuzione scriptlet in corso              :
wireguard-dkms-1:0.0.20171127-1.fc27.noarch                                                                      
1/1
errore: scriptlet %preun(wireguard-dkms-1:0.0.20171127-1.fc27.noarch)
fallita, uscita con stato 3
Error in PREUN scriptlet in rpm package wireguard-dkms
Error in PREUN scriptlet in rpm package wireguard-dkms
wireguard-dkms-1:0.0.20171127-1.fc27.noarch doveva essere eliminato, ma
non lo è stato!
  Verifica in corso                          :
wireguard-dkms-1:0.0.20171127-1.fc27.noarch                                                                      
1/1
 
Non riuscito:
  wireguard-dkms.noarch 1:0.0.20171127-1.fc27
Errore: Transazione non riuscita
=============

[18:32] <jdoss> rpm -qa |grep wireguard
[18:33] <me> jdoss: wireguard-dkms-0.0.20171127-1.fc27.noarch
[18:35] <jdoss> dkms remove -m wireguard -v 0.0.20171127 --all
[18:36] <me> jdoss: Error! There are no instances of module:
wireguard       0.0.20171127 located in the DKMS tree.
[18:37] <jdoss> That's a doozy
[18:37] <me> uh
[18:37] <jdoss> sounds like your dkms went rogue or you removed
wireguard outside of the RPM doing it's job
[18:37] <me> jdoss: no, I have never messed up with that stuff
[18:38] <me> I always used dnf and the copr repo
[18:38] <jdoss> sudo dkms add -m wireguard -v 0.0.20171127
[18:38] <me> jdoss: Creating symlink
/var/lib/dkms/wireguard/0.0.20171127/source ->          
/usr/src/wireguard-0.0.20171127          DKMS: add completed.
[18:39] <jdoss> sudo dkms build -m wireguard -v 0.0.20171127; sudo dkms
install -m wireguard -v 0.0.20171127
[18:40] <jdoss> the upgrade to 27 prob didn't care over well with dkms.
[18:41] <me> jdoss: output below

=============
# dkms build -m wireguard -v 0.0.20171127; dkms install -m wireguard -v
0.0.20171127

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
make -j4 KERNELRELEASE=4.13.16-300.fc27.x86_64 -C
/lib/modules/4.13.16-300.fc27.x86_64/build
M=/var/lib/dkms/wireguard/0.0.20171127/build.......
cleaning build area...

DKMS: build completed.

wireguard:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.13.16-300.fc27.x86_64/extra/
Adding any weak-modules

depmod......

DKMS: install completed.
output below =============

[18:41] <jdoss> dkms status
[18:41] <me> jdoss: wireguard, 0.0.20171127, 4.13.16-300.fc27.x86_64,
x86_64: installed
[18:42] <jdoss> should be good now
[18:42] <me> I suppose that now I have to reinstall the other wireguard
packages
[18:42] <jdoss> yea reinstall wireguard-tools
[18:43] <me> jdoss: yeah, now everything works fine, thank you very much
[18:43] <jdoss> no problem
[18:44] <me> jdoss: I am going to post the resolution to the mailing
list, in case anyone else is affected by the same problem