Passenger repository certificate verification failed

I want to install Passenger server on my virtual machine, so I do the following:

sudo sh -c "echo 'deb https://oss-binaries.phusionpassenger.com/apt/passenger trusty main' >> /etc/apt/sources.list.d/passenger.list"
sudo chown root: /etc/apt/sources.list.d/passenger.list
sudo chmod 600 /etc/apt/sources.list.d/passenger.list

But after I update

sudo apt-get update

I get this errors:

Err https://oss-binaries.phusionpassenger.com trusty/main amd64 Packages       
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Err https://oss-binaries.phusionpassenger.com trusty/main i386 Packages        
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Ign https://oss-binaries.phusionpassenger.com trusty/main Translation-en_US    
Ign https://oss-binaries.phusionpassenger.com trusty/main Translation-en       
Fetched 2,573 kB in 11s (220 kB/s)                                             
W: Failed to fetch https://oss-binaries.phusionpassenger.com/apt/passenger/dists/trusty/main/binary-amd64/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

W: Failed to fetch https://oss-binaries.phusionpassenger.com/apt/passenger/dists/trusty/main/binary-i386/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

E: Some index files failed to download. They have been ignored, or old ones used instead.

I already installed it previously many times and had no problems. I have no idea what might go wrong.

Answer

Fixed that by reinstalling Ubuntu on clean VM. This issue might appeared because I copied my VM’s without turning it off.