I have a 1TB external USB HDD. I have partitioned it as follows.
Disk /dev/sdb: 931.5 GiB, 1000204885504 bytes, 1953525167 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 33553920 bytes Disklabel type: gpt Disk identifier: 6C3FB5F1-7B50-11E3-BFCD-4C72B91262C0 Device Start End Sectors Size Type /dev/sdb1 2048 43007 40960 20M BIOS boot /dev/sdb2 206848 409806457 409599610 195.3G Linux filesystem /dev/sdb3 409806848 819406847 409600000 195.3G Linux filesystem /dev/sdb4 819406848 1229006847 409600000 195.3G Linux filesystem /dev/sdb5 1229006848 1536206847 307200000 146.5G Microsoft basic data /dev/sdb6 1536206848 1638606847 102400000 48.8G Linux swap /dev/sdb7 1638606848 1953523711 314916864 150.2G Linux filesystem /dev/sdb8 43008 206847 163840 80M Linux filesystem
When I started installing Ubuntu, by picking 'I want to do something else' during the initial setup - to install Ubuntu on external HDD. There I configured the partitions. The first partition
/dev/sdb1 is flagged as 'BIOS_GRUB'. (It was recommended by Ubuntu during the installation).
Then I configured the 'root' folder for
/dev/sdb2 and 'home' folder for
/dev/sdb4. I also asked the grub to be installed at
The installation went successfully, but after I restarted and tried to boot from the External HDD - it doesn't boot. I have the Ubuntu Live USB through which I am trying to diagnose/fix this.
Questions here are -
- What could be possible reasons behind this?
- What would be the ways to diagnose this?
- If the /dev/sdb1 was flagged as 'GRUB_BIOS' partition, then shouldn't GRUB be installed in this partition, than at the beginning of disk /dev/sdb? (in any case I do not get an option to install GRUB at /dev/sdb1 during the installation).
- Some more insights about how-where GRUB is installed and whats' the role of the 'GRUB-BIOS' partition?
Note - This question may look similar to another question on Ubuntu Forum How to Install Ubuntu on Portable External Drive, but it is not. Because I had followed the steps mentioned in that question to install Ubuntu on my External HDD. And the installation is completed successfully. But afterwards my PC doesn't boot, so I suspect this is more to do with GRUB and the various booting possibilities (like MBR, GPT)