Problem with getting access to some repositories

[fallart]

hi everybody! I have LMDE 2 x64 Mate Edition and since yesterday I have a problem with getting access to some repositories.
Error text:

Failed to fetch https://linuxdesktopcloud.cdnmail.ru/de ... 4/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Failed to fetch https://linuxdesktopcloud.cdnmail.ru/de ... 6/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Some index files failed to download. They have been ignored, or old ones used instead.

what can i do to fix it?

[GeneBenson]

Hi fallart,

Do those repositories have anything to do with Cloud Mail? They don't look like LMDE repositories.

[fallart]

Hi fallart,

Do those repositories have anything to do with Cloud Mail? They don't look like LMDE repositories.

oh, yeah. you can be right! thank you!