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LUKS encrypted partition detected but failed to mount

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Hello World,

I'm Ashwin seeking assistance with recovering and mounting an encrypted external hard drive on my Ubuntu system. Here's the situation:

Background:I recently attempted to encrypt my external hard drive, a Western Digital HDD extracted from an old laptop, using the LUKS encryption method following the documentation from RedHat's site. Before encryption, I was able to mount and use the drive via the /media folder.

Issue:After encryption, the drive stopped mounting, although it does prompt me for the password to unlock it when connected.

Decryption Attempt:Following the issues with mounting, I decrypted the drive, but the problem persists.

Screenshot of partitions on the disk

Important Information:

Here's the output of lsblk:

NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTSloop0         7:0    0     4K  1 loop /snap/bare/5loop1         7:1    0  55.7M  1 loop /snap/core18/2812loop2         7:2    0  55.7M  1 loop /snap/core18/2823loop3         7:3    0  63.9M  1 loop /snap/core20/2182loop4         7:4    0  63.9M  1 loop /snap/core20/2264loop5         7:5    0  74.2M  1 loop /snap/core22/1122loop6         7:6    0  74.2M  1 loop /snap/core22/1380loop7         7:7    0 268.3M  1 loop /snap/firefox/4090loop8         7:8    0 269.6M  1 loop /snap/firefox/4173loop9         7:9    0 346.3M  1 loop /snap/gnome-3-38-2004/119loop10        7:10   0 349.7M  1 loop /snap/gnome-3-38-2004/143loop11        7:11   0 504.2M  1 loop /snap/gnome-42-2204/172loop12        7:12   0 505.1M  1 loop /snap/gnome-42-2204/176loop13        7:13   0  91.7M  1 loop /snap/gtk-common-themes/1535loop14        7:14   0 853.7M  1 loop /snap/intellij-idea-community/495loop15        7:15   0 854.9M  1 loop /snap/intellij-idea-community/498loop16        7:16   0  25.4M  1 loop /snap/nvim/2819loop17        7:17   0   173M  1 loop /snap/postman/248loop18        7:18   0 176.1M  1 loop /snap/postman/250loop19        7:19   0  12.9M  1 loop /snap/snap-store/1113loop20        7:20   0  12.3M  1 loop /snap/snap-store/959loop21        7:21   0  39.1M  1 loop /snap/snapd/21184loop22        7:22   0  38.7M  1 loop /snap/snapd/21465loop23        7:23   0   476K  1 loop /snap/snapd-desktop-integration/157loop24        7:24   0   452K  1 loop /snap/snapd-desktop-integration/83sda           8:0    0 465.8G  0 disk ├─sda1        8:1    0   260M  0 part ├─sda2        8:2    0    16M  0 part ├─sda3        8:3    0 452.1G  0 part ├─sda4        8:4    0  1000M  0 part ├─sda5        8:5    0  11.5G  0 part └─sda6        8:6    0  1000M  0 part /media/ashwintemkar/LRS_ESPnvme0n1     259:0    0 476.9G  0 disk ├─nvme0n1p1 259:1    0   512M  0 part /boot/efi└─nvme0n1p2 259:2    0 476.4G  0 part /var/snap/firefox/common/host-hunspell

And the output of sudo fdisk -l:

Disk /dev/sda: 465.76 GiB, 500107861504 bytes, 976773167 sectorsDisk model: External        Units: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisklabel type: gptDisk identifier: 1CF816B9-2D8B-4AE5-8708-D650E0D14F81Device         Start       End   Sectors   Size Type/dev/sda1       2048    534527    532480   260M EFI System/dev/sda2     534528    567295     32768    16M Microsoft reserved/dev/sda3     567296 948660223 948092928 452.1G Microsoft basic data/dev/sda4  948662272 950710271   2048000  1000M Windows recovery environment/dev/sda5  950710272 974725119  24014848  11.5G Windows recovery environment/dev/sda6  974725120 976773119   2048000  1000M Lenovo boot partition

which mean it detects my drive but isn't letting me use the main partition

Additionally, running fsck /dev/sda3 gives the following error:

fsck from util-linux 2.37.2e2fsck 1.46.5 (30-Dec-2021)ext2fs_open2: Bad magic number in super-blockfsck.ext2: Superblock invalid, trying backup blocks...fsck.ext2: Bad magic number in super-block while trying to open /dev/sda3The superblock could not be read or does not describe a valid ext2/ext3/ext4filesystem.  If the device is valid and it really contains an ext2/ext3/ext4filesystem (and not swap or ufs or something else), then the superblockis corrupt, and you might try running e2fsck with an alternate superblock:    e2fsck -b 8193 <device> or    e2fsck -b 32768 <device>Found a dos partition table in /dev/sda3

Request:I need assistance in recovering and mounting the encrypted external hard drive without any data loss. The allocated data has not been overwritten yet.

Note:

I have been using sudo throughout the process.All data needs to be retrieved safely without any damage or loss.I appreciate any guidance or help on this matter. Thank you!

EDIT:

Before I unplugged it yesterday, I was getting following on lsblk

NAME           MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTSloop0            7:0    0     4K  1 loop  /snap/bare/5loop1            7:1    0  55.7M  1 loop  /snap/core18/2812loop2            7:2    0  55.7M  1 loop  /snap/core18/2823loop3            7:3    0  63.9M  1 loop  /snap/core20/2182loop4            7:4    0  63.9M  1 loop  /snap/core20/2264loop5            7:5    0  74.2M  1 loop  /snap/core22/1122loop6            7:6    0  74.2M  1 loop  /snap/core22/1380loop7            7:7    0 268.3M  1 loop  /snap/firefox/4090loop8            7:8    0 269.6M  1 loop  /snap/firefox/4173loop9            7:9    0 346.3M  1 loop  /snap/gnome-3-38-2004/119loop10           7:10   0 349.7M  1 loop  /snap/gnome-3-38-2004/143loop11           7:11   0 504.2M  1 loop  /snap/gnome-42-2204/172loop12           7:12   0 505.1M  1 loop  /snap/gnome-42-2204/176loop13           7:13   0  91.7M  1 loop  /snap/gtk-common-themes/1535loop14           7:14   0 853.7M  1 loop  /snap/intellij-idea-community/495loop15           7:15   0 854.9M  1 loop  /snap/intellij-idea-community/498loop16           7:16   0   173M  1 loop  /snap/postman/248loop17           7:17   0  12.9M  1 loop  /snap/snap-store/1113loop18           7:18   0  12.3M  1 loop  /snap/snap-store/959loop19           7:19   0  39.1M  1 loop  /snap/snapd/21184loop20           7:20   0  38.7M  1 loop  /snap/snapd/21465loop21           7:21   0   476K  1 loop  /snap/snapd-desktop-integration/157loop22           7:22   0   452K  1 loop  /snap/snapd-desktop-integration/83loop23           7:23   0 176.1M  1 loop  /snap/postman/250loop24           7:24   0  25.4M  1 loop  /snap/nvim/2819sda              8:0    0 465.8G  0 disk  ├─sda1           8:1    0   260M  0 part  ├─sda2           8:2    0    16M  0 part  ├─sda3           8:3    0 452.1G  0 part  │└─luks-3c96b225-9b52-4a62-a2cd-6fb4c3f497cc│              252:0    0 452.1G  0 crypt ├─sda4           8:4    0  1000M  0 part  ├─sda5           8:5    0  11.5G  0 part  └─sda6           8:6    0  1000M  0 part  /media/ashwintemkar/LRS_ESPnvme0n1        259:0    0 476.9G  0 disk  ├─nvme0n1p1    259:1    0   512M  0 part  /boot/efi└─nvme0n1p2    259:2    0 476.4G  0 part  /var/snap/firefox/common/host-hunspell

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