$ sudo apt-get update && sudo apt-get upgrade
Hit:1 http://download.virtualbox.org/virtualbox/debian xenial InRelease
Hit:2 http://se.archive.ubuntu.com/ubuntu xenial InRelease                     
Hit:3 http://se.archive.ubuntu.com/ubuntu xenial-updates InRelease             
Hit:4 http://se.archive.ubuntu.com/ubuntu xenial-backports InRelease           
Hit:5 http://archive.canonical.com/ubuntu xenial InRelease                     
Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     
Hit:7 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease    
Fetched 102 kB in 0s (263 kB/s)                                                
Reading package lists... Done
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  bsdutils libblkid1 libfdisk1 libmount1 libmysqlclient20:i386 libpam-systemd
  libsmartcols1 libsystemd0 libsystemd0:i386 libudev1 libudev1:i386 libuuid1
  libuuid1:i386 mount mysql-common systemd systemd-sysv udev util-linux
  uuid-runtime
20 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/7 730 kB of archives.
After this operation, 135 kB of additional disk space will be used.
Do you want to continue? [Y/n] 
dpkg: unrecoverable fatal error, aborting:
 files list file for package 'plymouth' is missing final newline
E: Sub-process /usr/bin/dpkg returned an error code (2)