I tried to install Ubuntu following all the instructions, but still the installation says "you need at least 8.6gb..."

Question

I am new to Ubuntu and recently I bought a new Dell Computer: Inspiron 13 5000 with 256 SSD, model i5379-5893GRY-PUS. I am trying to install Ubuntu.

I did try a lot of configurations, but none was successful. Things I already tried:

• Disable fast boot
• powercfg off
• AHCI enable
• Startup windows on safe mode and then restarting
• Disable security boot
• Partitioning on windows

I really don't know what else to try.

Commands:

$ fdisk -l

Disk /dev/loop0: 61.6 MiB, 64573440 bytes, 126120 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop1: 318.1 MiB, 333533184 bytes, 651432 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop2: 962 MiB, 1008779264 bytes, 1970272 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop3: 426.5 MiB, 447172608 bytes, 873384 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sda: 7.4 GiB, 7948206080 bytes, 15523840 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x4f4e129b

Device     Boot   Start     End Sectors  Size Id Type
/dev/sda1  *         64 3731283 3731220  1.8G cd unknown
/dev/sda2       3731284 3739475    8192    4M ef EFI (FAT-12/16/32)

$ lsblk -f (DONE USING MANJARO)

NAME   FSTYPE   LABEL    UUID                                 MOUNTPOINT
loop0  squashfs                                               /run/miso/sfs/livefs
loop1  squashfs                                               /run/miso/sfs/mhwdfs
loop2  squashfs                                               /run/miso/sfs/desktopfs
loop3  squashfs                                               /run/miso/sfs/rootfs
sda    iso9660  MJR17110 2018-05-07-20-05-15-00               /run/miso/bootmnt
├─sda1 iso9660  MJR17110 2018-05-07-20-05-15-00               
└─sda2 vfat     MISO_EFI FDB1-353B   

$ ls -ltr /dev/sda*

brw-rw---- 1 root disk 8, 0 Jul  4 05:36 /dev/sda
brw-rw---- 1 root disk 8, 2 Jul  4 05:36 /dev/sda2
brw-rw---- 1 root disk 8, 1 Jul  4 05:36 /dev/sda1

$ ls -ltr /dev/loop*

brw-rw---- 1 root disk  7,   7 Jul  4 05:36 /dev/loop7
brw-rw---- 1 root disk  7,   6 Jul  4 05:36 /dev/loop6
brw-rw---- 1 root disk  7,   5 Jul  4 05:36 /dev/loop5
brw-rw---- 1 root disk  7,   4 Jul  4 05:36 /dev/loop4
brw-rw---- 1 root disk  7,   2 Jul  4 05:36 /dev/loop2
brw-rw---- 1 root disk  7,   1 Jul  4 05:36 /dev/loop1
brw-rw---- 1 root disk  7,   0 Jul  4 05:36 /dev/loop0
crw-rw---- 1 root disk 10, 237 Jul  4 05:36 /dev/loop-control
brw-rw---- 1 root disk  7,   3 Jul  4 05:36 /dev/loop3

$ sudo lshw -C storage

*-usb:0                   
       description: Mass storage device
       product: USB Reader
       vendor: ChipsBnk
       physical id: 1
       bus info: usb@1:1
       logical name: scsi0
       version: 1.00
       serial: 110074973765
       capabilities: usb-2.00 scsi emulated scsi-host
       configuration: driver=usb-storage maxpower=100mA speed=480Mbit/s
  *-storage UNCLAIMED
       description: SATA controller
       product: Sunrise Point-LP SATA Controller [AHCI mode]
       vendor: Intel Corporation
       physical id: 17
       bus info: pci@0000:00:17.0
       version: 21
       width: 32 bits
       clock: 66MHz
       capabilities: storage msi pm ahci_1.0 cap_list
       configuration: latency=0
       resources: memory:d1230000-d1231fff memory:d1234000-d12340ff ioport:f090(size=8) ioport:f080(size=4) ioport:f060(size=32) memory:d1233000-d12337ff