Hello, againt want try to work little with wireguard and now something with the module happen. # modprobe wireguard modprobe: ERROR: could not insert 'wireguard': Exec format error # uname -a Linux fr-rb-1 4.20.2-arch1-1-ARCH #1 SMP PREEMPT Sun Jan 13 17:49:00 UTC 2019 x86_64 GNU/Linux # pacman -Ss linux | grep installed testing/linux 4.20.2.arch1-1 (base) [installed] testing/linux-headers 4.20.2.arch1-1 [installed] core/linux 4.20.1.arch1-1 (base) [installed: 4.20.2.arch1-1] core/linux-api-headers 4.17.11-1 [installed] core/linux-firmware 20181218.0f22c85-1 (base) [installed] core/linux-headers 4.20.1.arch1-1 [installed: 4.20.2.arch1-1] So normal is all installed what needed. # pacman -Ss wireguard | grep installed community/wireguard-arch 0.0.20181218-2 [installed] community/wireguard-tools 0.0.20181218-2 [installed] Have someone a idea? Silvio