root@cliff-ubuntu:/home/cliff# apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 linux-generic-hwe-16.04 : Depends: linux-headers-generic-hwe-16.04 (= 4.13.0.37.56) but 4.13.0.36.55 is installed
 linux-signed-generic-hwe-16.04 : Depends: linux-headers-generic-hwe-16.04 (= 4.13.0.37.56) but 4.13.0.36.55 is installed
E: Unmet dependencies. Try using -f.
root@cliff-ubuntu:/home/cliff# apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  linux-headers-4.8.0-36 linux-headers-4.8.0-36-generic
  linux-image-4.8.0-36-generic linux-image-extra-4.8.0-36-generic
  linux-signed-image-4.8.0-36-generic snap-confine
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  linux-headers-4.13.0-37 linux-headers-4.13.0-37-generic
  linux-headers-generic-hwe-16.04
The following NEW packages will be installed:
  linux-headers-4.13.0-37-generic
The following packages will be upgraded:
  linux-headers-4.13.0-37 linux-headers-generic-hwe-16.04
2 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
3 not fully installed or removed.
Need to get 0 B/11.4 MB of archives.
After this operation, 83.1 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
(Reading database ... 219200 files and directories currently installed.)
Preparing to unpack .../linux-headers-4.13.0-37_4.13.0-37.42~16.04.1_all.deb ...
Unpacking linux-headers-4.13.0-37 (4.13.0-37.42~16.04.1) over (4.13.0-37.42~16.04.1) ...



[1]+  Stopped                 apt-get -f install
root@cliff-ubuntu:/home/cliff#
root@cliff-ubuntu:/home/cliff#
root@cliff-ubuntu:/home/cliff# apt update
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Ign:2 http://linux.dropbox.com/ubuntu wily InRelease
Get:3 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Hit:4 http://linux.dropbox.com/ubuntu wily Release
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Get:7 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:8 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease
Fetched 306 kB in 1s (167 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
3 packages can be upgraded. Run 'apt list --upgradable' to see them.
root@cliff-ubuntu:/home/cliff# apt install npm
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
root@cliff-ubuntu:/home/cliff# fg 1
apt-get -f install
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^Cccc
ccc
^C^C^C^C^C^C^C^C^C^C^C^Ccc
cc