Thank you for taking the time to report this issue and helping to make
Ubuntu better.

This installation looks like it was caused by hardware problems (device
sda). There are messages such as

Jul  5 05:13:38 ubuntu kernel: [  110.984721] ata1.00: exception Emask 0x0 SAct 
0x40000001 SErr 0x0 action 0x0
Jul  5 05:13:38 ubuntu kernel: [  110.984734] ata1.00: irq_stat 0x40000008
Jul  5 05:13:38 ubuntu kernel: [  110.984742] ata1.00: failed command: READ 
FPDMA QUEUED
Jul  5 05:13:38 ubuntu kernel: [  110.984760] ata1.00: cmd 
60/08:00:18:00:00/00:00:00:00:00/40 tag 0 ncq dma 4096 in
Jul  5 05:13:38 ubuntu kernel: [  110.984760]          res 
41/40:00:18:00:00/00:00:00:00:00/40 Emask 0x409 (media error) <F>
Jul  5 05:13:38 ubuntu kernel: [  110.984768] ata1.00: status: { DRDY ERR }
Jul  5 05:13:38 ubuntu kernel: [  110.984774] ata1.00: error: { UNC }
Jul  5 05:13:38 ubuntu kernel: [  110.988311] ata1.00: configured for UDMA/100
Jul  5 05:13:38 ubuntu kernel: [  110.988328] sd 0:0:0:0: [sda] tag#0 FAILED 
Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Jul  5 05:13:38 ubuntu kernel: [  110.988332] sd 0:0:0:0: [sda] tag#0 Sense Key 
: Medium Error [current] 
Jul  5 05:13:38 ubuntu kernel: [  110.988334] sd 0:0:0:0: [sda] tag#0 Add. 
Sense: Unrecovered read error - auto reallocate failed
Jul  5 05:13:38 ubuntu kernel: [  110.988338] sd 0:0:0:0: [sda] tag#0 CDB: 
Read(10) 28 00 00 00 00 18 00 00 08 00
Jul  5 05:13:38 ubuntu kernel: [  110.988340] print_req_error: I/O error, dev 
sda, sector 24
Jul  5 05:13:38 ubuntu kernel: [  110.988344] Buffer I/O error on dev sda, 
logical block 3, async page read

I've marked this bug as incomplete (due hardware issues), if you believe
I'm in error please leave a comment as to why, and you can return the
status to "New".

I suggest you validate the health of your hardware (esp. disk by
checking it's SMART status using `smartctl`, `gnome-disks` or whichever
tool you prefer). If you're unfamiliar with these, I suggest seeking
looking up  refer to https://discourse.ubuntu.com/t/finding-help/709

** Changed in: grub-installer (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1886304

Title:
  grub  are not install

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