apt cheat sheet

apt_cheat_sheet.txt

### APT Tips (tested only on Ubuntu)
##
## Problem : 
## The following packages have been kept back
## 
## Possible Solutions (depending on the situation) : 

# non-manual upgrade of kept back packages (safest) : 
sudo apt-get --with-new-pkgs upgrade
sudo apt-get --with-new-pkgs upgrade <list of packages kept back>

# upgrade / install of new package version (not as great but is sometimes needed) : 
sudo apt-get install <packages which you will force upgarde / install>

# list installed version of particular package
sudo apt-cache policy <package-name>
sudo apt list -a <package-name>

# search for available versions of a particular pacakge
#   install rmadison from devscripts package eg : 
#   sudo apt-get install devscripts
sudo rmadison <package-name>

# upgrade to specific version of PHP (for example) - use policy example above to find the available versions
sudo apt-get install php5=5.5.16+dfsg-1+deb.sury.org~precise+2

# use aptitude to upgrade
sudo aptitude (then click "+" "+" "g" "g" then proceed by saying yes and finally quit aptitude).

# dist-upgrade approach - danger will robbinson this can break stuff : 
sudo apt-get dist-upgrade

# maybe just upate single package
sudo apt-get install --only-upgrade <package-name>

# enable auto updates on ubuntu (you will want to edit the file to configure things how you like)
sudo apt install unattended-upgrades && vim /etc/apt/apt.conf.d/50unattended-upgrades

# if you have errors like 
#    dpkg: error processing package update-notifier-common (--configure):
#     installed update-notifier-common package post-installation script subprocess returned error exit status 1
#    Errors were encountered while processing:
#     update-notifier-common
#    E: Sub-process /usr/bin/dpkg returned an error code (1)
cd /var/lib/dpkg
sudo mv -i info info.bak
sudo mkdir info
sudo apt-get upgrade

related_tips.txt

# check kernel + hardware
uname -srm

# check kernel + hardare + version
uname -srmv