The root error in your log appears to be:
Feb 27 18:05:02 ubuntu ubiquity: update-initramfs: Generating /boot/initrd.img-5.8.0-25-generic Feb 27 18:05:08 ubuntu kernel: [ 434.996976] EXT4-fs error (device sda2): ext4_lookup:1707: inode #3675785: comm cryptroot: iget: checksum invalid Feb 27 18:05:08 ubuntu kernel: [ 434.997716] Aborting journal on device sda2-8. Feb 27 18:05:08 ubuntu kernel: [ 434.998398] EXT4-fs (sda2): Remounting filesystem read-only
What options are you choosing when installing?
The root error in your log appears to be:
Feb 27 18:05:02 ubuntu ubiquity: update-initramfs: Generating /boot/initrd. img-5.8. 0-25-generic
Feb 27 18:05:08 ubuntu kernel: [ 434.996976] EXT4-fs error (device sda2): ext4_lookup:1707: inode #3675785: comm cryptroot: iget: checksum invalid
Feb 27 18:05:08 ubuntu kernel: [ 434.997716] Aborting journal on device sda2-8.
Feb 27 18:05:08 ubuntu kernel: [ 434.998398] EXT4-fs (sda2): Remounting filesystem read-only
What options are you choosing when installing?