Hi, You need to import needed gpg key.
Try something like this gpg --keyserver pgpkeys.mit.edu --recv-key 7638D0442B90D010 gpg -a --export 7638D0442B90D010 | sudo apt-key add - -- Eero 2017-09-16 11:57 GMT+03:00 Juha Manninen <juha.mannine...@gmail.com>: > Hello Debian people! My first post here. > > I have installed Debian 9.1.0 buster for i386 using the small netinst > image. Works well. I tested different desktops, too. > > I wanted to use the testing branch also after buster goes stable. > According to this page: > https://wiki.debian.org/DebianTesting > it is possible by editing /etc/apt/sources.list. > I followed the instructions and changed "buster" to "testing" and > commented out security update lines. > It now looks like this : > deb http://ftp.fi.debian.org/debian/ testing main > deb-src http://ftp.fi.debian.org/debian/ testing main > # deb http://security.debian.org/debian-security testing/updates main > deb http://deb.debian.org/debian/ testing contrib main > # deb-src http://security.debian.org/debian-security testing/updates main > > However running: > --- > # apt-get update > Nouda:1 http://deb.debian.org/debian testing InRelease [135 kB] > Vrhe:1 http://deb.debian.org/debian testing InRelease > Seuraavia allekirjoituksia ei voinut varmentaa koska julkista > avainta ei ole saatavilla: NO_PUBKEY 7638D0442B90D010 > Nouda:2 http://ftp.fi.debian.org/debian testing InRelease [135 kB] > Vrhe:2 http://ftp.fi.debian.org/debian testing InRelease > Seuraavia allekirjoituksia ei voinut varmentaa koska julkista > avainta ei ole saatavilla: NO_PUBKEY 7638D0442B90D010 > Noudettiin 270 kt ajassa 10s (26,7 kt/s) > Luetaan pakettiluetteloita... Valmis > W: An error occurred during the signature verification. The repository > is not updated and the previous index files will be used. GPG error: > http://deb.debian.org/debian testing InRelease: Seuraavia > allekirjoituksia ei voinut varmentaa koska julkista avainta ei ole > saatavilla: NO_PUBKEY 7638D0442B90D010 > W: An error occurred during the signature verification. The repository > is not updated and the previous index files will be used. GPG error: > http://ftp.fi.debian.org/debian testing InRelease: Seuraavia > allekirjoituksia ei voinut varmentaa koska julkista avainta ei ole > saatavilla: NO_PUBKEY 7638D0442B90D010 > W: Tiedoston http://ftp.fi.debian.org/debian/dists/testing/InRelease > nouto ei onnistunut Seuraavia allekirjoituksia ei voinut varmentaa > koska julkista avainta ei ole saatavilla: NO_PUBKEY 7638D0442B90D010 > W: Tiedoston http://deb.debian.org/debian/dists/testing/InRelease > nouto ei onnistunut Seuraavia allekirjoituksia ei voinut varmentaa > koska julkista avainta ei ole saatavilla: NO_PUBKEY 7638D0442B90D010 > W: Some index files failed to download. They have been ignored, or old > ones used instead. > --- > > Sorry, some errors are in Finnish due to my locale. I can try to > change that if required. > I found some post about GPG errors but no solutions really. > I have read some people successfully run Debian testing as a rolling > distro and the "DebianTesting" web page also says it is possible. > I am curious what is happening. > > BTW, the web page has conflicting info. After an orange exclamation > mark it says: > "If you are tracking testing or the next-stable code name, you should > always have a corresponding deb http://security.debian.org <"testing" > or codename>/updates main line in your /etc/apt/sources.list ." > ... although just earlier it told to remove any security lines. > This has no effect on the errors though. > > Now I am testing with VirtualBox. Later my goal is to keep some old > machines alive. They only can boot from a CD, no DVD nor USB. > Distros that support installation for such machines are getting > sparse. Most distros have dropped CD size images and also 32-bit CPUs. > > > Regards, > Juha Manninen > >
