Re: 12.04 Installer showing a blank hard drive during installation
Try running the cd in live mode and check what Gparted says about the disk.
If Gparted also doesn't recognize the partitions, there might be an error or corruption in the partition table.
If Gparted can see it correctly but the installer doesn't report partitions, usually the problem is raid meta data if the disk has been used in raid (or is configured in some sort of raid). In a laptop this is not very common, it's more common in desktops after people started playing with the bios raid option too much. If there are raid meta data leftovers on the disk, the ubuntu installer ignores it.
You can remove meta data with:
sudo dmraid -Er /dev/sda
but MAKE SURE it's not used first. Some Intel Rapid Storage configurations do use a smaller SSD combined with larger HDD in some strange raid config.
Darko.
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Ubuntu 18.04 LTS 64bit
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