Hello.
When I open Skype and wants to login, A message appeared and when I enter my Linux login or root password then the windows showed again.

How can I solve it?

Thank you.

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Do you have auto-login enabled?

If you go to ~/.local/share/keyrings (or your system's equivalent) and delete user.keystore then the next time you log in to skype you'll be asked to set a password (for skype). I believe you're only asked once per day or system session.

Informative post.

Linux auto-login or Skype? I never enabled.

Per day???

I don't really know. I tend to backup and switch off at the end of the day. Every time I restart and open skype, the keyring asks for the password. If I quit skype and open later in the day, it doesn't ask.

The root cause of this problem is exactly as the dialog-box says it is!

Skype, like many other computer applications (regardless of platform ...) uses some kind of a "secure keychain store" to hold confidential information securely. However, it now finds that it cannot unlock this keychain.

If you change your login password, you also need to change the cryptographic password of any keychains which expect the two to be the same.

(N.B.: The APIs in question do not require the application to actually know your login-password, but they will only be able to unlock the keychain when the crypto-password of that keychain is the same.)

I had a problem with skype some months ago. I cancelled the user.keystore file as I described above created a new password for skype only. It does not match any other password I have. Skype now works perfectly every time as long as I remember that one password.

It is a good thing that Skype and other applications make use of "encrypted keychain" technologies, as is now very commonly seen across most operating-system platforms. (Linux, OS/X, Windows ...) Even if they store data in their own encrypted files, they will store an obfuscated master-key token in the keychain, this being a very secure and yet easily accessible place to put it.

I routinely set up more-than-one such keychain, including not only the "default" one that's unlocked by my login, but additional ones that are secured using a different password. Where possible, I then direct the applications to use that keyring, which I set to "re-lock" itself after a short interval.

For example, my web-browser never stores web-site passwords. I store this information in "secure notes" within an appropriate non-default keychain. The information is of course not terribly protected, but it is protected, and in a way that any software which managed to compromise the web-browser environment can't reach. I use fairly-nonsensical web passwords, relying upon this technique to let me remember them. I then put the keychain password on a sticky-note attached to the bottom of my keyboard.

1 members found this post helpful.

For solve this problem I must change my login password?

Can you explain it?

There's not much more to explain. Your original post, I assumed, was that the keyring was storing a password for skype that you weren't aware of. As far as I can tell there's no way to operate skype without a password so my explanation in my first response was how to re-set that password.
Maybe I misread your post.

you set that with sudo when you first ran it. if you forgot your password.
do as per petelq said.
then marked solved

I had a bit of trouble with the same thing and got frustrated at Skype. But, But I fixed the stupid Keychain question by clicking CANCEL. Skype seems to be fine after that.
I've never heard of Keychain before but it sounds too deep for me to get involved with. Regards Ian.