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

A quick scan and I see the cause as being related to problems with
device sda

Jul  4 22:25:54 ubuntu kernel: [  774.181931] EXT4-fs error (device sda2): 
ext4_lookup:1701: inode #38803277: comm dpkg: iget: checksum invalid
Jul  4 22:25:54 ubuntu kernel: [  774.202471] Aborting journal on device sda2-8.
Jul  4 22:25:54 ubuntu kernel: [  774.225978] EXT4-fs (sda2): Remounting 
filesystem read-only

This error caused the file-system to flip RO (to prevent data-loss), and
the installation to subsequently fail.

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) https://help.ubuntu.com/community/Smartmontools. If
you're unfamiliar with these, I suggest seeking support, options
available can be seen at https://discourse.ubuntu.com/t/finding-help/709

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https://bugs.launchpad.net/bugs/1886290

Title:
  Install does not complete, installl app creashes. Wondering how I can
  fix it.

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