The previous installed system seems to make a difference, or maybe there is a difference between the daily iso file and the first point release.
In comment #6 I had a Lubuntu 16.04.5 LTS system installed, and it was still healthy, when installing Kubuntu bionic (actually from the kubuntu-18.04.1-desktop-amd64.iso file).
Now I split the file system of the installed Kubuntu 18.04.1 LTS, and it was corrupted, when when installing Kubuntu bionic (actually from the current daily live bionic-desktop-amd64.iso file dated August 9).
---
Pass 1: Checking inodes, blocks, and sizes
Inode 3588 extent block passes checks, but checksum does not match extent
(logical block 36864, physical block 760288, len 1241)
Fix<y>? yes
Inode 69150 extent block passes checks, but checksum does not match extent
(logical block 12288, physical block 1026593, len 31)
Fix<y>? yes
---
After these fixes, Kubuntu 18.04.1 LTS on /dev/sda4 works again. But the bash history is lost, so we can guess that is was affected by one of the inode errors.
The previous installed system seems to make a difference, or maybe there is a difference between the daily iso file and the first point release.
In comment #6 I had a Lubuntu 16.04.5 LTS system installed, and it was still healthy, when installing Kubuntu bionic (actually from the kubuntu- 18.04.1- desktop- amd64.iso file).
Now I split the file system of the installed Kubuntu 18.04.1 LTS, and it was corrupted, when when installing Kubuntu bionic (actually from the current daily live bionic- desktop- amd64.iso file dated August 9).
---
Pass 1: Checking inodes, blocks, and sizes
Inode 3588 extent block passes checks, but checksum does not match extent
(logical block 36864, physical block 760288, len 1241)
Fix<y>? yes
Inode 69150 extent block passes checks, but checksum does not match extent
(logical block 12288, physical block 1026593, len 31)
Fix<y>? yes
---
After these fixes, Kubuntu 18.04.1 LTS on /dev/sda4 works again. But the bash history is lost, so we can guess that is was affected by one of the inode errors.