I try to us Xshell to connect the windows and Linux (Ubuntu 16.04) installed in VirtualBox. but recently, they cannot communicate with each other. I shut down the firewall and used the "host-only" model, NAT and Bridge model. still doesn't work. someone suggested installing the ssh, and I found the openssh-client has been installed, but the openssh-server has not been installed, so I tried to install the openssh-server by commandline
sudo apt-get install openssh-server,
and the problems came as below: **
sudo apt-get install openssh-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package openssh-server is not available, but is referred to by another
package. This may mean that the package is missing, has been
obsoleted, or is only available from another source
E: Package 'openssh-server' has no installation candidate
** I tried to use "sudo apt-get update" and another question happened as following"
**
sudo apt-get update
Err:1 http://dl.google.com/linux/chrome/deb stable InRelease Temporary failure resolving 'dl.google.com'
Err:2 http://ca.archive.ubuntu.com/ubuntu xenial InRelease
Temporary failure resolving 'ca.archive.ubuntu.com' >
Reading package lists...Done>
W: Failed to fetch
http://ca.archive.ubuntu.com/ubuntu/dists/xenial/InRelease Temporary
failure resolving 'ca.archive.ubuntu.com'
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/InRelease
Temporary failure resolving 'dl.google.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.**
I changed the source, for instance, main source or Canda source. but doesn't work. I appreciate it so much who would like to give any help. Thanks a lot!
