After following couple of tutorials found on askubuntu, I tried to install Ubuntu 16.04 on Seagate Maxtor 1TB external hard disk.
I partition the hard disk using gParted to use GPT table, instead of MBR.
When running the installation I encounter the following problem.
The partition /dev/sdb3 assigned to / starts at an offset of 2048 bytes from the minimum alignment for this disk, which may lead to very poor performance.
Since you are formatting this partition, you should correct this problem now by realigning the partition, as it will be difficult to change later.
To do this, go back to the main partitioning menu, delete the partition, and recreate it in the same position with the same settings. This will cause the partition to start at a point best suited for this disk.
The partition are created correctly, also clicking the continue just close the dialog popup and nothing happens.
Strange thing I notice is that, at the beginning there are 33MB of unallocated disk space. Usually this number is 1MB on my main HDD.
Just to notice, this is not my first time installing Linux, but it is my first time encountering this message.