Your hard disk is failing:

May  2 19:07:22 ubuntu kernel: [ 1005.644069] ata1.00: exception Emask 0x0 SAct 
0x0 SErr 0x0 action 0x0
May  2 19:07:22 ubuntu kernel: [ 1005.644077] ata1.00: BMDMA stat 0x24
May  2 19:07:22 ubuntu kernel: [ 1005.644084] ata1.00: failed command: READ DMA
May  2 19:07:22 ubuntu kernel: [ 1005.644094] ata1.00: cmd 
c8/00:08:18:a0:bb/00:00:00:00:00/e3 tag 0 dma 4096 in
May  2 19:07:22 ubuntu kernel: [ 1005.644094]          res 
51/40:00:18:a0:bb/00:00:00:00:00/e3 Emask 0x9 (media error)
May  2 19:07:22 ubuntu kernel: [ 1005.644099] ata1.00: status: { DRDY ERR }


** Changed in: ubiquity (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1687728

Title:
  boot has become corrupted

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