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I want to install Ubuntu x64 without having to back-up everything to an external drive.

What would be the necessary steps to mount the encrypted hard-disk during the installation?

The rest should be a normal installation, I guess.

fdisk -l output

Disk /dev/sda: 8004 MB, 8004304896 bytes
255 heads, 63 sectors/track, 973 cylinders, total 15633408 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 identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          32    15633407     7816688    7  HPFS/NTFS/exFAT

Disk /dev/sdb: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 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 identifier: 0x00029535

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        2048      976895      487424   83  Linux
/dev/sdb2          978942   625141759   312081409    5  Extended
/dev/sdb5          978944   625141759   312081408   83  Linux

Disk /dev/sdc: 8004 MB, 8004304896 bytes
255 heads, 63 sectors/track, 973 cylinders, total 15633408 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 identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *          32    15633407     7816688    b  W95 FAT32

Disk /dev/mapper/sda5_crypt: 319.6 GB, 319569264640 bytes
255 heads, 63 sectors/track, 38852 cylinders, total 624158720 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 identifier: 0x00000000

Disk /dev/mapper/sda5_crypt doesn't contain a valid partition table

Disk /dev/mapper/eT420VG-lvswap: 511 MB, 511705088 bytes
255 heads, 63 sectors/track, 62 cylinders, total 999424 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 identifier: 0x00000000

Disk /dev/mapper/eT420VG-lvswap doesn't contain a valid partition table

Disk /dev/mapper/eT420VG-lvroot: 25.0 GB, 24998051840 bytes
255 heads, 63 sectors/track, 3039 cylinders, total 48824320 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 identifier: 0x00000000

Disk /dev/mapper/eT420VG-lvroot doesn't contain a valid partition table

Disk /dev/mapper/eT420VG-lvhome: 294.1 GB, 294058459136 bytes
255 heads, 63 sectors/track, 35750 cylinders, total 574332928 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 identifier: 0x00000000

Disk /dev/mapper/eT420VG-lvhome doesn't contain a valid partition table

lvdisplay output

--- Logical volume ---
LV Name                /dev/eT420VG/lvswap
VG Name                eT420VG
LV UUID                51PHec-YLBQ-X9Fp-nbFz-C7HM-lLCW-OR39hE
LV Write Access        read/write
LV Status              available
# open                 2
LV Size                488.00 MiB
Current LE             122
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:1

--- Logical volume ---
LV Name                /dev/eT420VG/lvroot
VG Name                eT420VG
LV UUID                a2OHht-79QG-iJFK-n91J-5psk-Toot-Ga9TbB
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                23.28 GiB
Current LE             5960
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:2

--- Logical volume ---
LV Name                /dev/eT420VG/lvhome
VG Name                eT420VG
LV UUID                u3NYc5-HbuP-4vah-TOxZ-ws5w-Go0P-40rcxI
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                273.86 GiB
Current LE             70109
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:3
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