can't add public key normally

**mohamed-ali-mhenni** · September 13th, 2019

Hello every one i have an odroid with ubuntu 16.04 on it and i have a probleme
when i walt to add the repo with this commande

Code:

sudo add-apt-repository ppa:deluge-team/stable

it's ok but when i use

Code:

sudo apt update

an error came out

Code:

Hit:2 http://ports.ubuntu.com/ubuntu-ports xenial InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports xenial-updates InRelease            
Hit:4 http://ports.ubuntu.com/ubuntu-ports xenial-backports InRelease          
Get:1 http://ppa.launchpad.net/deluge-team/stable/ubuntu xenial InRelease [17.5 kB]
Hit:5 http://ports.ubuntu.com/ubuntu-ports xenial-security InRelease           
Err:1 http://ppa.launchpad.net/deluge-team/stable/ubuntu xenial InRelease      
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C5E6A5ED249AD24C
Reading package lists... Done
N: Ignoring file 'C5E6A5ED249AD24C.key' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
W: GPG error: http://ppa.launchpad.net/deluge-team/stable/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C5E6A5ED249AD24C
E: The repository 'http://ppa.launchpad.net/deluge-team/stable/ubuntu xenial InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

i tried to add the key with apt-key add and even with the PGP PUBLIC KEY BLOCK but failed
when i type

Code:

sudo apt-key list

this error show

**mohamed-ali-mhenni** · September 13th, 2019

Sorry this was the error from sudo apt-key list

/etc/apt/trusted.gpg
--------------------
pub 1024D/437D05B5 2004-09-12
uid Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
sub 2048g/79164387 2004-09-12

pub 4096R/C0B21F32 2012-05-11
uid Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>

pub 4096R/EFE21092 2012-05-11
uid Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>

pub 1024D/FBB75451 2004-12-30
uid Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>

/usr/bin/sort: 1: /usr/bin/sort: 1O�PP��!KA��: not found
/usr/bin/sort: 1: /usr/bin/sort: �M�Q��
��M��xh��F�E��
��F��i�#FpGBi*��~��B~*�у~{�*��CS��*�ѐ� *��~��F��~�C~+F�Jb#
p#Ki�B�d#pC�2+:�Sf!p�g3�,B�h3�,Ji �B�ip�3�M3�,�~�n3�,�~�R3�,��r3� ,��: not found
/usr/bin/sort: 2: /usr/bin/sort: Syntax error: "(" unexpected

**oldos2er** · September 13th, 2019

Moved to General Help. The Resolution Centre is "the place to contact a forum admin concerning problems with your forum account, to appeal moderator action, to request a thread be moved from the jail, or to file a complaint about forum harrassment or abuse."