It looks like there was an error reading and writing to your partition
/dev/sda1:

Apr  9 23:57:00 ubuntu kernel: [  441.076810] EXT4-fs error (device sda1): 
ext4_mb_generate_buddy:757: group 1729, block bitmap and bg descriptor 
inconsistent: 2644 vs 2628 free clusters
Apr  9 23:57:00 ubuntu kernel: [  441.076821] Aborting journal on device sda1-8.
Apr  9 23:57:00 ubuntu kernel: [  441.077377] EXT4-fs (sda1): Remounting 
filesystem read-only

Earlier in the log we can see:

Apr  9 23:51:57 ubuntu kernel: [  138.502134] EXT4-fs (sda1): warning: mounting 
fs with errors, running e2fsck is recommended
Apr  9 23:51:57 ubuntu kernel: [  138.504604] EXT4-fs (sda1): mounted 
filesystem with ordered data mode. Opts: (null)
Apr  9 23:52:10 ubuntu ubiquity[2386]: debconffilter_done: ubi-partman 
(current: ubi-partman)

I'd recommend running e2fsck on that partition and trying the install
again.

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

** Changed in: ubiquity (Ubuntu)
   Importance: High => Medium

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https://bugs.launchpad.net/bugs/1442434

Title:
  installer crash

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