Initramfs after Kubuntu 16.04 installation - possibly partitioning error

[Guest]

I installed Kubuntu on my desktop, which had Windows 8.1 installed. The dual-boot options appear but when I try to boot into Kubuntu, I get stuck at an Initramfs terminal. Booting with Live USB, sudo fdisk -lu returns this:

Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x730c4ee9

Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 206847 204800 100M 7 HPFS/NTFS /exFAT
/dev/sdb2 206848 1502089214 1501882367 716.2G 7 HPFS/NTFS /exFAT
/dev/sdb3 1952602112 1953521663 919552 449M 27 Hidden NTFS WinRE
/dev/sdb4 1502089215 1952602111 450512897 214.8G 5 Extended
/dev/sdb5 1502089216 1919082495 416993280 198.9G 83 Linux
/dev/sdb6 1919084544 1952602111 33517568 16G 82 Linux swap / Solaris

Partition 4 does not start on physical sector boundary.
Partition table entries are not in disk order.
Can somebody help me, please?

I also posted the question in Askubuntu, without any answers:
http://askubuntu.com/questions/79475...itioning-error
Thanks

[Qqmike]

I can't imagine that this is anything serious. Your disk looks OK. I would ignore this, certainly for now:

Partition 4 does not start on physical sector boundary.
Partition table entries are not in disk order.

I've had this happen many times -- NBD.

So, I would simply try Boot-Repair. Run it, and hope it will fix the booting by re-installing GRUB.
https://help.ubuntu.com/community/Boot-Repair
It's a good utility to have handy for future use, too.

[Guest]

Qqmike, thanks a lot. Just tried it and it worked perfectly. You're the man

[Qqmike]

Good, got lucky again
Welcome to the Kubuntu forum, felipegalvao.