gpg errors NO_PUBKEY after aptitude update

Hi!

I'm experiencing some troubles with updating my debian machine.

After aptitude update i'm having multiple errors like these:

W: GPG error: http://deb.ianod.es unstable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 498F1DF0598C5C38

W: GPG error: http://deb.ianod.es experimental InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 498F1DF0598C5C38

W: GPG error: http://repo.ajenti.org main InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BDC3FBAA53029759

W: GPG error: http://download.tuxfamily.org unstable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1392A97E41317877

W: GPG error: http://liquorix.net sid InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3EFF4F272FB2CD80

W: GPG error: http://dicson.no-ip.info unstable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9A8B35945CFC0244

W: GPG error: http://www.duinsoft.nl debs InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E18CE6625CB26B26

W: GPG error: http://notesalexp.org sid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7FE04CB66C536B44

W: GPG error: http://repo.acestream.org sid InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 50E2BCF0E3805CD8

W: GPG error: http://packages.siduction.org unstable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 15CBD88045C45076

W: GPG error: http://download.virtualbox.org wheezy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 54422A4B98AB5139

W: GPG error: http://linux.dropbox.com sid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FC918B335044912E

W: GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A040830F7FAC5991

However, all these keys are present:

LANG=C apt-key list

/etc/apt/trusted.gpg

--------------------

pub 1024D/7FAC5991 2007-03-08

uid Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>

sub 2048g/C07CB649 2007-03-08

pub 1024D/6DFBCBAE 2008-07-14

uid Sun Microsystems, Inc. (xVM VirtualBox archive signing key) <info@virtualbox.org>

sub 2048g/78A86EAF 2008-07-14

pub 1024D/0BF795DC 2009-03-20 [expired: 2010-03-20]

uid Martin Alfke <tuxmea@gmail.com>

uid Martin Alfke <martin@ppcnux.de>

pub 1024D/5CFC0244 2007-11-24

uid gcue2tracks-dev-keyring (gcue2tracks) <fominde@gmail.com>

uid Fomin Denis <fominde@mail.ru>

sub 1024g/FE875B4B 2007-11-24

pub 1024D/2FB2CD80 2009-05-11

uid Steven Barrett <damentz@gmail.com>

sub 2048g/AF06A3FF 2009-05-11

pub 1024D/98AB5139 2010-05-18

uid Oracle Corporation (VirtualBox archive signing key) <info@virtualbox.org>

sub 2048g/281DDC4B 2010-05-18

pub 1024D/433E270B 2009-02-08 [expired: 2011-02-08]

uid Filip Chabik (Hadret) <hadret@gmail.com>

pub 1024D/41317877 2008-04-27

uid Cairo-Dock Team (Cairo-Dock Official Repository) <repository@glx-dock.org>

uid Cairo-Dock Team (Cairo-Dock Official Repository) <repository@cairo-dock.org>

uid [jpeg image of size 1197]

sub 2048g/00836283 2008-04-27

pub 3072D/6C536B44 2010-01-03

uid Alexander Pozdnyakov <almipo@mail.ru>

sub 3072g/32C56745 2010-01-03

pub 4096R/EE903351 2011-01-23

uid Filip Chabik (Hadret) <hadret@gmail.com>

uid Filip Chabik (Hadret) <filip@chabik.com>

sub 4096R/2FC292BA 2011-01-23

pub 1024D/C4676186 2010-12-23

uid PlayOnLinux Packaging (PlayOnLinux packaging keys) <packages@playonlinux.com>

pub 2048R/5044912E 2010-02-11

uid Dropbox Automatic Signing Key <linux@dropbox.com>

pub 2048R/53029759 2011-06-12

uid Eugeny Pankov <e@ajenti.org>

uid Ajenti Packagers <e@ajenti.org>

sub 2048R/CBABA17C 2011-06-12

pub 1024D/B9FBE3CE 2011-01-22

uid Warren Woodford (MEPIS Maintainers) <dev@mepis.org>

sub 1024g/5C010C44 2011-01-22

pub 2048R/22A63EF6 2011-04-08

uid Steve Clark <steveclark@gmx.com>

sub 2048R/FD92B23A 2011-04-08

pub 2048R/3E40B160 2011-04-09

uid Steve Clark

sub 2048R/18728851 2011-04-09

pub 4096R/89DF5277 2010-07-11

uid Guillaume Plessis <gui@dotdeb.org>

sub 4096R/3D624A3B 2010-07-11

sub 4096R/A2098A6E 2010-07-11

pub 2048R/5CB26B26 2011-07-12

uid Duinsoft Packages <pkg@duinsoft.nl>

sub 2048R/726A2EC2 2011-07-12

pub 4096R/598C5C38 2012-07-15

uid Filip Chabik (Hadret) <hadret@gmail.com>

sub 4096R/630AB798 2012-07-15

pub 1024R/10826689 2011-12-15

uid Launchpad PPA for Alexander Mieland

pub 2048R/B05498B7 2012-12-07

uid Valve Corporation <linux@steampowered.com>

sub 2048R/C081CFD1 2012-12-07

pub 2048R/E3805CD8 2012-07-07

uid TorrentStream (TorrentStream products) <tsviewer@gmail.com>

sub 2048R/7476C667 2012-07-07

pub 2048R/8C360DDC 2012-06-14

uid Sorokin Alexei <sor.alexei@hotbox.ru>

sub 2048R/3382E805 2012-06-14

pub 2048R/72740199 2012-06-11

uid Christian Svedin (gurka) <christian.svedin@gmail.com>

sub 2048R/6720BD05 2012-06-11

pub 4096R/45C45076 2011-09-19 [expires: 2021-09-16]

uid Siduction Repository (The Siduction Repository) <repository@siduction.org>

sub 4096R/05BF7E4F 2011-09-19 [expires: 2021-09-16]

/etc/apt/trusted.gpg.d/debian-archive-jessie-stable.gpg

-------------------------------------------------------

pub 4096R/518E17E1 2013-08-17 [expires: 2021-08-15]

uid Jessie Stable Release Key <debian-release@lists.debian.org>

/etc/apt/trusted.gpg.d/debian-archive-keyring.gpg

-------------------------------------------------

pub 4096R/B98321F9 2010-08-07 [expires: 2017-08-05]

uid Squeeze Stable Release Key <debian-release@lists.debian.org>

pub 4096R/473041FA 2010-08-27 [expires: 2018-03-05]

uid Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@debian.org>

/etc/apt/trusted.gpg.d/debian-archive-squeeze-automatic.gpg

-----------------------------------------------------------

pub 4096R/473041FA 2010-08-27 [expires: 2018-03-05]

uid Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@debian.org>

/etc/apt/trusted.gpg.d/debian-archive-squeeze-stable.gpg

--------------------------------------------------------

pub 4096R/B98321F9 2010-08-07 [expires: 2017-08-05]

uid Squeeze Stable Release Key <debian-release@lists.debian.org>

/etc/apt/trusted.gpg.d/debian-archive-wheezy-automatic.gpg

----------------------------------------------------------

pub 4096R/46925553 2012-04-27 [expires: 2020-04-25]

uid Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org>

/etc/apt/trusted.gpg.d/debian-archive-wheezy-stable.gpg

-------------------------------------------------------

pub 4096R/65FFB764 2012-05-08 [expires: 2019-05-07]

uid Wheezy Stable Release Key <debian-release@lists.debian.org>

/etc/apt/trusted.gpg.d/debian-ports-archive-2013.gpg

----------------------------------------------------

pub 4096R/2FF7A9F4 2012-12-30 [expired: 2014-01-31]

uid Debian Ports Archive Automatic Signing Key (2013) <ftpmaster@debian-ports.org>

/etc/apt/trusted.gpg.d/debian-ports-archive-2014.gpg

----------------------------------------------------

pub 4096R/623DB0B8 2014-01-16 [expires: 2015-01-31]

uid Debian Ports Archive Automatic Signing Key (2014) <ftpmaster@debian-ports.org>

/etc/apt/trusted.gpg.d/steam.gpg

--------------------------------

pub 2048R/B05498B7 2012-12-07

uid Valve Corporation <linux@steampowered.com>

sub 2048R/C081CFD1 2012-12-07

/etc/apt/trusted.gpg.d/valve-archive-keyring.gpg

------------------------------------------------

pub 2048R/D0BBF5AE 2013-10-08

uid Valve builder achive signing key <linux@steampowered.com>

sub 2048R/9E36D781 2013-10-08

pub 2048R/8ABDDD96 2013-11-05

uid Valve SteamOS Release Key <steamos@steampowered.com>

sub 2048R/103C02AE 2013-11-05

What can i do to resolve this situation?

--

Best regards,

Valery Mamonov.