Ubuntu16.04 boots into initramfs

execute:

(initramfs) fsck /dev/mapper/ubuntu--vg-root

select 'y' to all 'Fix?' prompts

Note, your root partition maybe something other than /dev/mapper/ubuntu--vg-root - modify this part appropriate to the location of your boot partition

It seems that you have a bad superblock. To fix this just follow the following steps:

Step 1: boot into a live CD or USB and select try ubuntu without installing options

Step 2: Press ctrl+alt+t or open your terminal

Setp 3:

Find out your partition number by using

sudo fdisk -l|grep Linux|grep -Ev 'swap'

Then, list all superblocks by using the command:

sudo dumpe2fs /dev/sda7 | grep superblock

Replace sda7 to your drive number

You should get a similar output like this

Primary superblock at 0, Group descriptors at 1-6
  Backup superblock at 32768, Group descriptors at 32769-32774
  Backup superblock at 98304, Group descriptors at 98305-98310
  Backup superblock at 163840, Group descriptors at 163841-163846
  Backup superblock at 229376, Group descriptors at 229377-229382
  Backup superblock at 294912, Group descriptors at 294913-294918
  Backup superblock at 819200, Group descriptors at 819201-819206
  Backup superblock at 884736, Group descriptors at 884737-884742
  Backup superblock at 1605632, Group descriptors at 1605633-1605638
  Backup superblock at 2654208, Group descriptors at 2654209-2654214
  Backup superblock at 4096000, Group descriptors at 4096001-4096006
  Backup superblock at 7962624, Group descriptors at 7962625-7962630
  Backup superblock at 11239424, Group descriptors at 11239425-11239430
  Backup superblock at 20480000, Group descriptors at 20480001-20480006
  Backup superblock at 23887872, Group descriptors at 23887873-23887878

Choose an alternate superblock from this list, for this case alternate superblock # 32768

Now, to check and repair a Linux file system using alternate superblock # 32768:

sudo fsck -b 32768 /dev/sda7 -y

The -y flag is used to skip all the Fix? questions and to answer them all with a yes automatically

You should get similar output like this:

fsck 1.40.2 (12-Jul-2007)
e2fsck 1.40.2 (12-Jul-2007)
/dev/sda2 was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong for group #241 (32254, counted=32253).
Fix? yes
Free blocks count wrong for group #362 (32254, counted=32248).
Fix? yes
Free blocks count wrong for group #368 (32254, counted=27774).
Fix? yes
..........
/dev/sda2: ***** FILE SYSTEM WAS MODIFIED *****
/dev/sda2: 59586/30539776 files (0.6% non-contiguous), 3604682/61059048 blocks

Now try mounting the partition

sudo mount /dev/sda7 /mnt

Now, try to browse the filesystem with the following commands

cd /mnt
sudo mkdir test
ls -l

If you are able to perform the above commands, you have most probably fixed your problem.

Now, restart you computer and you should be able to boot normally.

(Source)

Ubuntu16.04 boots into initramfs

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