Le 04/08/2020 à 08:31, lpeci a écrit : > I had the same problem with my UEFI bios machine and I fixed it so for Centos 7: > > 1) Boot from an rescue linux usb > > 2) When the rescue system is running: > > 2.1) #chroot /mnt/sysimage > > 3) Config network: > > 3.1) # ip addr add X.X.X.X/X dev X > > 3.2) # ip route add default via X.X.X.X <--- default router > > 4) And finally: > > #yum downgrade shim\* grub2\* mokutil > > #exit > > #reboot > > I hope you can fix it with these steps. Thanks for the detailed suggestion. Unfortunately I couldn't recover the installation, and I had to redo everything from scratch, which cost me the first two days of my holidays. One thought regularly kept crossing my mind: "How on earth could this have passed Q & A ?" :o) Cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info at microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12