Due to a failure during upgrade to Kubuntu 16.04 from 15.10, on my dual-boot Windows 10/Kubuntu Dell Vostro 3450, I have been trying to upgrade to Ubuntu from Live DVD manually, using the "Something else" option, but it keeps failing, without displaying an error, after "Install Now". There is a warning popup displayed regarding partition misalignment:
The partition /dev/sda5 assigned to / starts at an offset of 3072 bytes from the minimum alignment for this disk, which may lead to very poor performance.
but based on what I have read elsewhere, I should be able to proceed anyway. However, when I click on the Continue button to proceed, it doesn't seem to
do anything, and takes me back to the partitioning window.
Internet connection is disconnected and the "Download updates while installing" and "Install third-party software" options are also unticked, which was identified as a possible cause elsewhere, but no joy.
Any idea how to get beyond this step? Help would be much appreciated, as I have now lost access to my Windows OS as well, due to restart taking me to the grub rescue menu (I may have written changes to disk during an earlier manual install attempt), which I have been unable to repair.
Additional information:
Before I attempted to reinstall, the original partition table was like this:
/dev/sda1 fat16 101.94 Mib 357.00 Kib 101.60 Kib diag
unallocated unallocated 2.02 Mib -- --
/dev/sda2 ntfs RECOVERY 19.53 Gib 8.81 Gib 10.73 Gib boot
/dev/sda3 ntfs OS 379.00 Gib 120.89 Gib 258.12 Gib
unallocated unallocated 2.48 Mib -- --
/dev/sda4 extended 300.00 Gib -- --
/dev/sda5 ext4 root 32.01 Gib 14.52 Gib 17.48 Gib
/dev/sda6 linux-swap 16.00 Gib 0.00 Gib 16.00 Gib
/dev/sda7 ntfs share 32.01 Gib 133.43 Mib 31.87 Gib
/dev/sda8 ext4 home 219.98 Gib 17.10 Gib 202.89 Gib
unallocated unallocated 2.49 Mib -- --
After my first attempt at a reinstall, when the sda5 changes had been written to disk (which presumably is the reason why grub goes to the rescue prompt) the partition table is now:
/dev/sda1 fat16 101.94 Mib 357.00 Kib 101.60 Kib diag
unallocated unallocated 2.02 Mib -- --
/dev/sda2 ntfs RECOVERY 19.53 Gib 8.81 Gib 10.73 Gib boot
/dev/sda3 ntfs OS 379.00 Gib 120.89 Gib 258.12 Gib
unallocated unallocated 2.48 Mib -- --
/dev/sda4 extended 300.00 Gib -- --
/dev/sda5 ext4 32.01 Gib 691.08 Mib 31.33 Gib
/dev/sda6 linux-swap 16.00 Gib 0.00 Gib 16.00 Gib
/dev/sda7 ntfs share 32.01 Gib 133.43 Mib 31.87 Gib
/dev/sda8 ext4 home 219.98 Gib 17.10 Gib 202.89 Gib
unallocated unallocated 2.49 Mib -- --
As per @CelticWarrior's suggestion, I was able to proceed beyond the "Install Now" and complete re-installation of Ubuntu on my dual-boot laptop, once I selected all Linux partitions (bar the NTFS /share) without formatting.
However, I don't have an answer to why it succeeds when formatting is not selected but fails otherwise.
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