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I recently deleted Windows from my Laptop and installed Ubuntu to use it as a main operating system (no other operating system beside Ubuntu installed). So I want to delete Ubuntu now. I want no operating system on my Laptop. How can I do it?

Redouan Azizim
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2 Answers2

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Simply delete all partitions and data from your hard disk.

You can make a bootable USB that contains a disk manager like gparted, or just use GUI tools like "Disks" in a live Ubuntu session by selecting "Try Ubuntu" when booting from Ubuntu installation media. You can even use disk formatting tools from a Windows bootable USB.

Nmath
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Ali Naderi Parizi
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If you want to remove all partitions, you can boot from a live usb and run fdisk -l to find your hard disk and then run fdisk /dev/sdX and type o to create a new MBR partition table. If you want a GPT partition table, you have to run gdisk /dev/sdX and type o to cerate a new GPT partition table. To write and exit type w. To abort write q.

For example

# fdisk -l
Disk /dev/sda: 149.05 GiB, 160041885696 bytes, 312581808 sectors
Disk model:
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: gpt
Disk identifier: 457A8416-1E69-4BB7-B84A-E731240D648E

Device         Start       End   Sectors  Size Type
/dev/sda1       2048     18431     16384    8M BIOS boot
/dev/sda2      18432   1067007   1048576  512M EFI System
/dev/sda3    1067008 273696767 272629760  130G Linux filesystem
/dev/sda4  273696768 312581774  38885007 18.5G Linux swap


Disk /dev/sdb: 30.05 GiB, 32262586368 bytes, 63012864 sectors
Disk model: USB Flash Disk
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: 0x63a44614


Device     Boot Start     End Sectors  Size Id Type
/dev/sdb1  *        0 2543423 2543424  1.2G  0 Empty
/dev/sdb2         172  131243  131072   64M ef EFI (FAT-12/16/32)

/dev/sda is the hard disk (150 GB) and /dev/sdb is the USB.

# fdisk /dev/sda

Welcome to fdisk (util-linux 2.36).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): o
Created a new DOS disklabel with disk identifier 0x5bd5b3e4.


Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

Creating a MBR partition table.

# gdisk /dev/sda
GPT fdisk (gdisk) version 1.0.5

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


Found valid GPT with protective MBR; using GPT.


Command (? for help): o
This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): y


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.
The operation has completed successfully.

Creating a GPT partition table.

The data will still be recoverable (/on the disk), but it wouldn't show up in your file manager. If you want to erase it permanently (/overwrite it with random data) you can use fdisk -l to find the hard disk and use dd if=/dev/urandom of=/dev/sdX status=progress to overwritet it with random data and then use fdisk for a MBR partiton table and gdisk for a GPT partition table (see above)

For example:

/dev/sda is the hard disk

# dd if=/dev/urandom of=/dev/sda status=progress
150000000000 bytes (139 GB, 150 GiB) copied, 882 s, 170 MB/s
292968750+0 records in
292968750+0 records out
150000000000 bytes (139 GB, 150 GiB) copied, 882.35294 s, 170 MB/s

Overwriting it with random data

See above for creating the partition tables

MaxSilvester
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