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I installed Ubuntu 16.04 LTS and chose the option to remove all and set an encrypted LVM(I have a backup of all my data).

I have 1 SSD(/dev/sda) and 1 HDD(/dev/sdb).
What the installer did:
It set LVM for /dev/sda and that's all, it didn't touch /dev/sdb.

What I try to do and can't find info about(there is info on what I try to do but not with LVM + encryption - at least from what I could find):
- Remove encryption from the root /(that's not that important, but I don't need security for that data, I would like performance)
- Set /home, /var and /tmp to be on the encrypted HDD(/dev/sdb) - this is the main issue
- Remove swap from the SSD

Relevant fdisk -l output:

Disk /dev/sda: 119,2 GiB, 128035676160 bytes, 250069680 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: 0xb607a342

Device     Boot   Start       End   Sectors   Size Id Type
/dev/sda1  *       2048    999423    997376   487M 83 Linux
/dev/sda2       1001470 250068991 249067522 118,8G  5 Extended
/dev/sda5       1001472 250068991 249067520 118,8G 83 Linux


Disk /dev/sdb: 698,7 GiB, 750156374016 bytes, 1465149168 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: 3E77BD28-907B-4CDD-B5A9-5886A8E3CF74

Device     Start        End    Sectors   Size Type
/dev/sdb1   2048 1465149134 1465147087 698,7G Linux LVM


Disk /dev/mapper/sda5_crypt: 118,8 GiB, 127520473088 bytes, 249063424 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/mapper/ubuntu--vg-root: 110,8 GiB, 119000793088 bytes, 232423424 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/mapper/ubuntu--vg-swap_1: 7,9 GiB, 8493465600 bytes, 16588800 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

Any guru out there? :)

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  • I found something that might be helpful(I'll try later): askubuntu.com/questions/260777/…
    – Lilian A. Moraru
    Apr 18, 2016 at 8:00
  • I managed to remove the swap and add it back to root, and also managed to add the HDD with LVM + encryption. But after a restart I observed that the boot is slow after decrypting the volume, so I decided now to go for a Ubuntu Server install(makes it easy to set-up LVM) and then "sudo apt install ubuntu-desktop -y"
    – Lilian A. Moraru
    Apr 18, 2016 at 19:50
  • The best way to add additional information to your question is by editing it, with the edit button. It is better visible that way, and comments are mainly for secondary, temporary purposes. Comments are removed under a variety of circumstances. Anything important to your question should be in the question itself.
    – guntbert
    Apr 20, 2016 at 19:19
  • @guntbert Well, those were comments/remarks that are not important to the question itself... As for my issue, I solved it the next day and it sits on my "to do" list for a pretty long time to write a detailed answer on how somebody else can solve this same issue(I have it in a raw draft in my email). I would also like to remark that it saddens me that nobody came with any help. If I would of been a user that has no experience with Linux, I would of sat even now with a broken system...
    – Lilian A. Moraru
    May 3, 2016 at 13:05

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