192020-10-20 13:51:48ngfw-proxy.verwaltung.uni-muenchen.degrub.conf -> grub.cfg182016-09-14 16:00:4891.253.54.36172016-09-14 15:59:2491.253.54.36162016-09-14 15:55:3491.253.54.36152016-09-14 15:54:3191.253.54.36142016-09-14 15:52:4491.253.54.36132016-09-14 15:33:2391.253.54.36122016-09-14 14:43:1991.253.54.36112016-09-14 13:48:5291.253.54.36102016-09-14 13:45:3891.253.54.3692016-09-14 13:43:5491.253.54.3682016-09-14 13:37:0391.253.54.3672016-09-14 13:28:5591.253.54.3662016-09-14 13:24:3191.253.54.3652016-09-14 12:52:1291.253.54.3642016-09-14 12:43:1591.253.54.3632016-09-14 11:59:47104-102rev.amm.uniroma1.it22016-09-14 11:20:19104-102rev.amm.uniroma1.it12016-09-14 11:19:31104-102rev.amm.uniroma1.itAn Hybrid UEFI GPT + BIOS GPT/MBR boot USB disk is a disk that works on both UEFI and BIOS PCs.

A working Linux installation with the following packages: grub2, grub2-efi, gdisk (on Debian Jessie: grub-pc-bin, grub-efi, grub-efi-amd64, gdisk) An USB drive Some Linux ISO.

From now on we will use a root shell because almost all commands we will use require it. root@debianvm:~# fdisk -l............... Disk /dev/sdc: 14.9 GiB, 16005464064 bytes, 31260672 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000Device Boot Start End Sectors Size Id Type /dev/sdc1 2 31260671 31260670 14.9G af HFS / HFS+Find the right dev (ie: mine was /dev/sdc and I WILL USE IT IN THE GUIDE, you have to use your dev).

root@debianvm:~# gdisk /dev/sdc And then we are in gdisk prompt; from now on just give the commands in bold and the press enter. GPT fdisk (gdisk) version 0.8.10Partition table scan:MBR: MBR only BSD: not present APM: not present GPT: not present*************************************************************** Found invalid GPT and valid MBR; converting MBR to GPT format in memory. THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by typing 'q' if you don't want to convert your MBR partitions to GPT format! ***************************************************************Warning! Main partition table overlaps the first partition by 32 blocks! You will need to delete this partition or resize it in another utility.Warning! Secondary partition table overlaps the last partition by 33 blocks! You will need to delete this partition or resize it in another utility.Command (? for help): o This option deletes all partitions and creates a new protective MBR. Proceed? (Y/N): yCommand (? for help): n Partition number (1-128, default 1): First sector (34-31260638, default = 2048) or {+-}size{KMGTP}: Last sector (2048-31260638, default = 31260638) or {+-}size{KMGTP}: +1M Current type is 'Linux filesystem' Hex code or GUID (L to show codes, Enter = 8300): EF02 Changed type of partition to 'BIOS boot partition' Command (? for help): n Partition number (2-128, default 2): First sector (34-31260638, default = 4096) or {+-}size{KMGTP}: Last sector (4096-31260638, default = 31260638) or {+-}size{KMGTP}: +50M Current type is 'Linux filesystem' Hex code or GUID (L to show codes, Enter = 8300): EF00 Changed type of partition to 'EFI System'Command (? for help): n Partition number (3-128, default 3): First sector (34-31260638, default = 106496) or {+-}size{KMGTP}: Last sector (106496-31260638, default = 31260638) or {+-}size{KMGTP}: Current type is 'Linux filesystem' Hex code or GUID (L to show codes, Enter = 8300): 0700 Changed type of partition to 'Microsoft basic data'Command (? for help): w Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING PARTITIONS!!Do you want to proceed? (Y/N): y OK; writing new GUID partition table (GPT) to /dev/sdc. The operation has completed successfully. Now gdisk will quit, it's ok.

root@debianvm:~# gdisk /dev/sdc GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Command (? for help): r Recovery/transformation command (? for help): h WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one, just hit the Enter key at the below prompt and your MBR partition table will be untouched. Type from one to three GPT partition numbers, separated by spaces, to be added to the hybrid MBR, in sequence: 1 2 3 Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): n Creating entry for GPT partition #1 (MBR partition #1) Enter an MBR hex code (default EF): EF02 Set the bootable flag? (Y/N): n Creating entry for GPT partition #2 (MBR partition #2) Enter an MBR hex code (default EF): EF00 Set the bootable flag? (Y/N): n Creating entry for GPT partition #3 (MBR partition #3) Enter an MBR hex code (default 07): 0700 Set the bootable flag? (Y/N): y Recovery/transformation command (? for help): w Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING PARTITIONS!! Do you want to proceed? (Y/N): y OK; writing new GUID partition table (GPT) to /dev/sdc. The operation has completed successfully. gdisk will quit (again) and it's ok.

We have to format in FAT32 two of the three partitions, /dev/sdc2 and /dev/sdc3. Umount the partitions if mounted and then: root@debianvm:~# mkfs.fat -F32 -n GRUB2EFI /dev/sdc2 mkfs.fat 3.0.27 (2014-11-12)root@debianvm:~# mkfs.fat -F32 -n DATA /dev/sdc3 mkfs.fat 3.0.27 (2014-11-12)Now the partitons are ready, we will mount /devsdc2 to /mnt/efi and /dev/sdc3 to /mnt/data. root@debianvm:~# mkdir /mnt/efi root@debianvm:~# mkdir /mnt/data root@debianvm:~# mount /dev/sdc2 /mnt/efi/ root@debianvm:~# mount /dev/sdc3 /mnt/data/

In this step we will install grub in EFI partition (mounted in /mnt/efi) and in MBR. root@debianvm:~# grub-install --target=x86_64-efi --efi-directory=/mnt/efi --boot-directory=/mnt/data/boot --removable --recheck Installing for x86_64-efi platform. Installation finished. No error reported.root@debianvm:~# grub-install --target=i386-pc --boot-directory=/mnt/data/boot --recheck /dev/sdc Installing for i386-pc platform. Installation finished. No error reported.

In /mnt/data we should now have only one directory, boot; let's create a directory for the ISOs. root@debianvm:~# mkdir /mnt/data/iso In /mnt/data we should now have /mnt/data/ - - - - - - - /boot/ - - - - - - - - - - - /grub/ - - - - - - - /iso/ Now we add 2 folders in /iso, one for the other ISOs and one for Debian (this is a workaround for a known bug). root@debianvm:~# mkdir /mnt/data/iso/debian root@debianvm:~# mkdir /mnt/data/iso/othersLet's download some ISOs, here i will explain ho to configure grub to boot Debian XFCE amd64 Installer and Tails i386; here there are instructions for other distros.

Download: iso from http or torrent vmlinuz initrd And put these files into /mnt/data/debian/

Download the iso torrent. Then create a folder for tails and copy there the iso. root@debianvm:~# mkdir /mnt/data/others/tailsIn /mnt/data we should now have /mnt/data/ - - - - - - - /boot/ - - - - - - - - - - - /grub/ - - - - - - - /iso/ - - - - - - - - - - - /debian/ - - - - - - - - - - - - - - - - debian-8.5.0-amd64-xfce-CD-1.iso - - - - - - - - - - - - - - - - vmlinuz - - - - - - - - - - - - - - - - initrd.gz - - - - - - - - - - - /others/ - - - - - - - - - - - - - - - - /tails/ - - - - - - - - - - - - - - - - - - - - tails-i386-2.5.iso

Now we need to configure grub; grub at boot reads its config from a config file (grub.cfg). Create a grub.cfg file with the following content and copy it into /mnt/data/boot/grub/: It's done! If you want to customize grub's background copy a .jpg into /mnt/boot/grub/ and rename it grub_bg.jpg. Now unmount the USB drive and test it. root@debianvm:~# umount /mnt/efi root@debianvm:~# umount /mnt/dataSources: arch linux wiki and many other sites.