Comment 8 for bug 1783757

Now I split the file system of the installed system in /dev/sda5, and it was corrupted, when when installing Kubuntu bionic (actually from the first point release, the kubuntu-18.04.1-desktop-amd64.iso file) into /dev/sda6.

These two last installs were made in Swedish, 'alongside', and in both cases finished by reboot, when the installer finished.

This time I repaired the file system of /dev/sda5 from the installed system in /dev/sda6, and after that it works again. This time the bash history survived after repairing, so some other file(s) resided in the bad inodes.

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tester@tester-SATELLITE-PRO-C850-19W:~$ sudo e2fsck -f /dev/sda5
e2fsck 1.44.1 (24-Mar-2018)
/dev/sda5: återhämtar journalen
Pass 1: Kontrollerar inoder, block och storlekar
Utsträckningsblocken för inod 25021 klarar kontroller, men kontrollsumman stämmer inte med utsträckningarna
        (logiskt block 9, fysiskt block 4806166, längd 1)
Fixa<j>? ja

Pass 2: Kontrollerar katalogstruktur
Pass 3: Kontrollerar katalogförbindelser
Pass 4: Kontrollerar referensräknare
Pass 5: Kontrollerar gruppsammanfattningsinformation
Antal fria inoder är fel (1782394, räknade=1782393).
Fixa<j>? ja

/dev/sda5: ***** FILSYSTEMET MODIFIERADES *****
/dev/sda5: 200071/1982464 filer (0.1% ej sammanhängande), 2110951/7909704 block
tester@tester-SATELLITE-PRO-C850-19W:~$
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Conclusion:

Installing both the first point release and the current daily iso file are affected by this bug. It seems that some but not all previous systems (and their versions of ext4 file systems) are affected. When the previous system is Bionic it is affected, which is bad enough to make this bug relevant.