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I did dual booting

with windows 8.1 and Ubuntu 18.04,

In BIOS i didn't disable Secure boot,

1st i installed windows 8.1, in disk manager i separated 1st partition for windows 2 partition for Ubuntu and 3 partition (450 GB) for data.

After i installed Ubuntu 18.04 during set up of Ubuntu i didn't check the secure boot,

After installation, i was able to run through grup the Ubuntu

But i select windows boot manager from grup windows not showing up, neither any message. (blank screen only)

i checked "sudo fdisk -l"

and got the following, help me please i think i did something wrong in selecting the Ubuntu boot manger

Disk /dev/loop0: 2.3 MiB, 2433024 bytes, 4752 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 /dev/loop1: 14.5 MiB, 15196160 bytes, 29680 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 /dev/loop2: 140.9 MiB, 147722240 bytes, 288520 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 /dev/loop3: 13 MiB, 13619200 bytes, 26600 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 /dev/loop4: 34.7 MiB, 36323328 bytes, 70944 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 /dev/loop5: 86.9 MiB, 91099136 bytes, 177928 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 /dev/loop6: 3.7 MiB, 3887104 bytes, 7592 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 /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 68701701-E9CC-414F-ACF1-26638DD852B6

Device         Start        End   Sectors   Size Type
/dev/sda1       2048     616447    614400   300M Windows recovery environment
/dev/sda2     616448     819199    202752    99M EFI System
/dev/sda3     819200    1081343    262144   128M Microsoft reserved
/dev/sda4    1081344  491982847 490901504 234.1G Microsoft basic data
/dev/sda5  977301504 1953521663 976220160 465.5G Microsoft basic data


Disk /dev/sdb: 22.4 GiB, 24015495168 bytes, 46905264 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: gpt
Disk identifier: 0D8E2F7D-2948-411A-A7B0-CDAEED1B782B

Device        Start      End  Sectors  Size Type
/dev/sdb1      2048 16779263 16777216    8G Intel Fast Flash
/dev/sdb2  16779264 32403455 15624192  7.5G Linux swap
/dev/sdb3  32403456 46903295 14499840  6.9G Linux filesystem
  • Can you boot windows directly from the EFI boot menu (some function key at power-up)? Some machines still may not be able to boot windows through grub with secure boot enabled. – ubfan1 Jul 29 '18 at 15:49
  • Are drives in AHCI mode in UEFI. IF not be sure to add AHCI driver to Windows first. So show a Intel SRT/flast flash for Windows hibernation fast start up. You need that off in Windows and could then use that 8GB on SSD for / (root) plus the 6.9GB you already allocated. The 6.9GB is very small. I also would not have swap on SSD or use entire 22GB for /. Grub only boots working Windows or Windows that is not hibernated. askubuntu.com/questions/843153/… You still should be able to boot Windows directly from UEFI boot menu. – oldfred Jul 29 '18 at 16:37
  • Hai there, Pardon me, I am new (fresh) to linux (ubuntu). i found out that i had installed the Ubuntu 18.04 in the SSD hard drive instead of the main Hard drive. Now what i can do is i can enter into Ubunto through grub but i cannot enter into windows 8.1 through grub. If i press enter windows boot manager in the grup it just blank screen. Can i delete the parttion in SSD using live ubuntu USB and then will it boot windows as ubunto is deleted? @mook765 – MOHAMED SHAFI Jul 30 '18 at 5:39
  • Hi Shafi, even if ubuntu is in SSD and windows in HDD, you can boot into ubuntu and install Boot-Repair. It fixes most booting problems with one click. – Habeel Mazhar Sep 28 '18 at 16:57

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