[ubuntu] Reinstall ubuntu 14.04

It would help if you gave us a full description of the partition layout. The simple solution to any re-install is to use the Erase disk & install Ubuntu option. That will work great if we do not care about any other OS on the drive or any data we may have collected. What is your situation?

I do not accept that conclusion. I put in an install of 16.04 development version just 2 weeks ago and it went into the partition I wanted it to go. It was sdb1 if you are interested. There was already another install of 16.04 in that partition. I used the Something Else option. We have to select the partition and then click Change. We then get a dialog box where we set

1) the installation type from a drop down menu. The usual type is Ext4.
2) tick or not tick the box labelled format the partition
3) set the mount point from a drop down menu in a panel labelled mount point. To install Ubuntu the mount point should be /

We caot install Ubuntu in a partition unless the partition has been given a mount point of /. We can set partitions to have other mount points but if we have not set a mount point we will be told about it when we click OK.

When we install Ubuntu to a partition if we have not set a mount point of / then, when we are back at the partition screen and we click Install Now we get told that we have not set a mount point of /. And we have to start again.

Regards