At this moment i have no grub at all, i am using a live usb in order to come here at this forum for help.
I tried many options, Partedmagic (grub-doctor), Supergrub2, Rescaut grub, and it looks like they can not detect or read anything. i tried too some commands by the terminal and follow some tutors, but nothing work.
I checked with Gparted and the partitions with the systems are still there, and ...
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# LANG=C fdisk -l
Disk /dev/sda: 640.1 GB, 640135028736 bytes, 1250263728 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
Disk label type: dos
Identificador del disco: 0x000f1103
Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/sda1 2048 202545016 101271484+ 83 Linux
/dev/sda2 202545152 204695551 1075200 82 Linux swap / Solaris
/dev/sda3 204695552 407535615 101420032 83 Linux
/dev/sda4 407537662 1250263039 421362689 5 Extended
/dev/sda5 * 407537664 604735487 98598912 83 Linux
/dev/sda6 604737536 1250263039 322762752 83 Linux
root@partedmagic:~#
Thanks for any advice.