[HTC One A9] nkk71:
not that this was not a "learning experience" for me, but here you go:

1- clean install of Ubuntu 14.04.2 LTS (64bit)

nkk71@ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.2 LTS
Release:	14.04
Codename:	trusty

2- no updates whatsover

3- download and try to extract 'Universal_HTC_Decrypt_Tool-v2.0.0.7z'

4- archive manager wants 7zip extension -> allow to install

5- extract files to folder

nkk71@ubuntu:/media/nkk71/RUU/test$ ls -l
total 36
-rwxrwxr-x 1 nkk71 nkk71 19280 Jan 11 08:48 decrypt-htc
drwxrwxr-x 2 nkk71 nkk71 4096 Jan 11 09:05 place_rom_zip_here
drwxrwxr-x 2 nkk71 nkk71 4096 Feb 12 09:00 place_ruu_here
-rw-rw-r-- 1 nkk71 nkk71 1256 Jan 11 08:50 readme.txt
drwxrwxr-x 7 nkk71 nkk71 4096 Jan 11 09:09 tools

6- run decryption

nkk71@ubuntu:/media/nkk71/RUU/test$ ./decrypt-htc

Welcome to the RUU extraction and decryption script!

Extracting temporary files...
Extracting rom zip files...
Extracting rom.zip...done.
Extracting android-info.txt...done.
Cleaning up...
Done!

Extracting ZIP files
LargeZip format detected, using ruuveal
ruuveal
-------

Large zip format detected containing 6 zipfile(s)
Dumped (copied) zip file to: 01_dmp.zip
Dumped (copied) zip file to: 02_dmp.zip
Dumped (copied) zip file to: 03_dmp.zip
Dumped (copied) zip file to: 04_dmp.zip
Dumped (copied) zip file to: 05_dmp.zip
Dumped (copied) zip file to: 06_dmp.zip
Finished: Successfully extracted zip files to '/media/nkk71/RUU/test/working/extract'

Model ID found by extracting android-info.txt from RUU. Model ID identified as: 0P6B

Looking for keyfile: 0P6B_keyfile_6.bin

Attempting to find suitable keyfile

Locating 'AIK-Linux'

Encrypted zip to be used for testing: '01_dmp.zip'

Attempting to extract hboot/hosd
Archive: 06_dmp.zip
warning [06_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hboot*

Archive: 04_dmp.zip
warning [04_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hboot*

Archive: 02_dmp.zip
warning [02_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hboot*

Archive: 03_dmp.zip
warning [03_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hboot*

Archive: 05_dmp.zip
warning [05_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hboot*

Archive: 01_dmp.zip
warning [01_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
file #1: bad zipfile offset (local header sig): 308
(attempting to re-compensate)
file #1: bad zipfile offset (local header sig): 308

6 archives had fatal errors.
Archive: 06_dmp.zip
warning [06_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hosd*

Archive: 04_dmp.zip
warning [04_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hosd*

Archive: 02_dmp.zip
warning [02_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hosd*

Archive: 03_dmp.zip
warning [03_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hosd*

Archive: 05_dmp.zip
warning [05_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hosd*

Archive: 01_dmp.zip
warning [01_dmp.zip]: 128 extra bytes at beginning or within zipfile
(attempting to process anyway)
caution: filename not matched: hosd*

6 archives had fatal errors.
Could not extract hboot/hosd, trying known keys instead...

Testing keyfile (*.bin)...
ruuveal
-------

WARNING: ruuveal failed!
ERROR: could not find suitable decryption key!

This is a last-ditch effort to decrypt your ROM.
For newer HTC devices, please provide hosd.img if available for your device.
For older devices, please provide hboot.img. Place the file in the 'working' folder and type the filename below. Then press [ENTER] to continue.
If you don't have an input file, press [ENTER] to exit.
hboot_signedbyaa_6.20.654.3.img

Attempting to find suitable keyfile

Locating 'AIK-Linux'

Encrypted zip to be used for testing: '01_dmp.zip'

User supplied hboot/hosd: '/media/nkk71/RUU/test/working/hboot_signedbyaa_6.20.654.3.img'

'4026hb_file'

Attempting to generate keyfile

bruutveal
---------

SUCCESS!rcing key[loop 2]: 843106/2096384....
Successful bruutveal run, key written to: tmp/decryptkey
Finished: successfully found decryption key, copied to '/media/nkk71/RUU/test/tools/keyfiles/new-keyfile.bin'

New keyfile created. Using keyfile: 0P6B_keyfile_6.bin

Decrypting ZIP files

Decrypting 01_dmp.zip
Encrypted zip detected, running ruuveal...
ruuveal
-------

Decrypted RUU (zip) written to: /media/nkk71/RUU/test/working/decrypt/decrypted_zips/dec_01_dmp.zip

Decrypting 02_dmp.zip
Encrypted zip detected, running ruuveal...
ruuveal
-------

Decrypted RUU (zip) written to: /media/nkk71/RUU/test/working/decrypt/decrypted_zips/dec_02_dmp.zip

Decrypting 03_dmp.zip
Encrypted zip detected, running ruuveal...
ruuveal
-------

Decrypted RUU (zip) written to: /media/nkk71/RUU/test/working/decrypt/decrypted_zips/dec_03_dmp.zip

Decrypting 04_dmp.zip
Encrypted zip detected, running ruuveal...
ruuveal
-------

Decrypted RUU (zip) written to: /media/nkk71/RUU/test/working/decrypt/decrypted_zips/dec_04_dmp.zip

Decrypting 05_dmp.zip
Encrypted zip detected, running ruuveal...
ruuveal
-------

Decrypted RUU (zip) written to: /media/nkk71/RUU/test/working/decrypt/decrypted_zips/dec_05_dmp.zip

Decrypting 06_dmp.zip
Encrypted zip detected, running ruuveal...
ruuveal
-------

Decrypted RUU (zip) written to: /media/nkk71/RUU/test/working/decrypt/decrypted_zips/dec_06_dmp.zip

Unzipping decrypted zips
Archive: decrypted_zips/dec_02_dmp.zip
inflating: decrypted_all/system_1.img
inflating: decrypted_all/android-info.txt
inflating: decrypted_all/android-info-1.txt

Archive: decrypted_zips/dec_04_dmp.zip
inflating: decrypted_all/system_3.img
inflating: decrypted_all/android-info-3.txt

Archive: decrypted_zips/dec_01_dmp.zip
inflating: decrypted_all/hboot_signedbyaa.img
inflating: decrypted_all/sbl1-8974AB-1.img
inflating: decrypted_all/sbl1-8974AB-2.img
inflating: decrypted_all/sbl1-8974AA-1.img
inflating: decrypted_all/sdi.img
inflating: decrypted_all/rpm.img
inflating: decrypted_all/boot_signed.img
inflating: decrypted_all/recovery_signed.img
inflating: decrypted_all/adsp.img
inflating: decrypted_all/wcnss.img
inflating: decrypted_all/radio.img
inflating: decrypted_all/rcdata.img
inflating: decrypted_all/rfg_1.img
inflating: decrypted_all/modem_st1.img
inflating: decrypted_all/modem_st2.img
inflating: decrypted_all/tz.img
inflating: decrypted_all/pg2fs_spcustom.img
inflating: decrypted_all/sensor_hub.img
inflating: decrypted_all/tp_SYN3508.img
inflating: decrypted_all/tp_SYN3528.img
inflating: decrypted_all/splash1.nb0
inflating: decrypted_all/rconfig.img
inflating: decrypted_all/rfg_2.img

Archive: decrypted_zips/dec_05_dmp.zip
inflating: decrypted_all/system_4.img
inflating: decrypted_all/android-info-4.txt

Archive: decrypted_zips/dec_06_dmp.zip
inflating: decrypted_all/dzdata_16g.hdr
inflating: decrypted_all/dzdata_16g.img
inflating: decrypted_all/dzdata_32g.hdr
inflating: decrypted_all/dzdata_32g.img

Archive: decrypted_zips/dec_03_dmp.zip
inflating: decrypted_all/system_2.img
inflating: decrypted_all/android-info-2.txt

6 archives were successfully processed.

Move system img files to system folder
‘decrypted_all/system_1.img’ -> ‘decrypted_system/system_1.img’
‘decrypted_all/system_2.img’ -> ‘decrypted_system/system_2.img’
‘decrypted_all/system_3.img’ -> ‘decrypted_system/system_3.img’
‘decrypted_all/system_4.img’ -> ‘decrypted_system/system_4.img’
Finished: Successfully decrypted RUU to '/media/nkk71/RUU/test/working/decrypt'

/media/nkk71/RUU/test/working/decrypt/decrypted_system
/media/nkk71/RUU/test/out

Attempting to create system.img
Multi-part system images
Sparse Header not found, using simple concatenate
Please be patient, this can take several minutes...finished.
Testing system.img...
e2fsck 1.42.9 (4-Feb-2014)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/media/nkk71/RUU/test/out/system.img: 3347/172032 files (0.0% non-contiguous), 602666/688128 blocks
Finished: Successfully created system.img in '/media/nkk71/RUU/test/out'

Renaming and moving files...

Rom.zip has been renamed for your device.

Boot image extracted from firmware.zip. boot.img & system.img can be used as base for building a new ROM.

Script complete! Files can be found in the 'out' folder. Enjoy your decrypted system!

7- check the output

nkk71@ubuntu:/media/nkk71/RUU/test$ cd out
nkk71@ubuntu:/media/nkk71/RUU/test/out$ ls -l
total 4372076
-rw-rw-r-- 1 nkk71 nkk71 1645418970 Feb 12 09:08 0P6BIMG.zip
-rw-rw-r-- 1 nkk71 nkk71 12996864 Jan 7 16:54 boot.img
drwxrwxr-x 2 nkk71 nkk71 4096 Feb 12 09:14 firmware
-rw-rw-r-- 1 nkk71 nkk71 2818572288 Feb 12 09:14 system.img
nkk71@ubuntu:/media/nkk71/RUU/test/out$

Now had you actually copy/pasted the needed information, instead of

you might have saved yourself the trouble of updating, and me having to write all this :eek::rolleyes: