Thanks you very much.
Yes, in fact, I had errors during sudo apt update. So I remove some deposits (skype and others). Now it's ok. I can upgrade 16.04 to 18.04.
Unable to upgrade Ubuntu 16.04 to 20.04 [duplicate]
Thanks you very much.
Yes, in fact, I had errors during sudo apt update. So I remove some deposits (skype and others). Now it's ok. I can upgrade 16.04 to 18.04.