Multiple errors on installing Ubuntu after Windows 10

Question

(Please even read the comments to understand better)

So let me start from the beginning.

I downloaded Ubuntu in my Windows 10 and burned it to the USB. When I restarted I saw boot options and selected Install Linux. I reached a step where I needed to format all the data. I closed the PC as it was very late night.

When I opened the PC next time it was showing

Boot device not found

After many attempts I knew that I had to install Linux so I started. I selected "Erase the disk" and got the following error:

So, I selected the "Something else" and I got these partitions:

I also formatted the disk through the Disks tool and now they are as follows:

The GParted screenshot:

and log

:======================
libparted : 2.3
======================

(gpartedbin:19666): GLib-CRITICAL **: Source ID 7 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 6 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 10 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 9 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 29 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 28 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 56 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 55 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 60 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 59 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 66 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 65 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 73 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 72 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 79 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 78 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 84 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 83 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 87 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 86 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 92 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 91 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 95 was not found when attempting to remove it

(gpartedbin:19666): GLib-CRITICAL **: Source ID 94 was not found when attempting to remove it
/dev/sdb contains GPT signatures, indicating that it has a GPT table.  However, it does not have a valid fake msdos partition table, as it should.  Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables.  Or perhaps you deleted the GPT table, and are now using an msdos partition table.  Is this a GPT partition table?

command sudo gdisk -l /dev/sda gave the following result:

GPT fdisk (gdisk) version 0.8.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 976773168 sectors, 465.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): D66EE60C-6D4C-4668-8DD8-94D5AAA8A182
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 976773134
Partitions will be aligned on 2048-sector boundaries
Total free space is 4077 sectors (2.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048         1050623   512.0 MiB   EF00  
   2         1050624         1550335   244.0 MiB   8300  
   3         1550336       976771071   465.0 GiB   8E00  

gdisk log :

sudo gdisk /dev/sda
GPT fdisk (gdisk) version 0.8.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): x

Expert command (? for help): n

Expert command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/sda.
yWarning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.

Answer 1

I found out by playing little by the command given by @TomYan

i used sudo gdisk -> x -> z

it wiped the whole partition and rebooted (and i was on liveusb so i just clicked restart and then enter on later screen)

it restarted i clicked "Something else" clicked that partition made it logical then i made mount point / and clicked continue it warned me about swap but i continued and it successfully installed

after it restarted i added the sawp partition