On my freshly installed ubuntu 18.06 my cron job use 'apt-get' as 'apt' is not recommended to be used in scripts. however, 'apt-get update' will keep back my packages while 'apt upgrade' will upgrade them, this is not expected.
root@do-u1804:~# apt update Hit:1 https://repos.sonar.digitalocean.com/apt main InRelease Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB] Hit:3 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease Get:4 http://nyc2.mirrors.digitalocean.com/ubuntu bionic InRelease [242 kB] Hit:5 http://nyc2.mirrors.digitalocean.com/ubuntu bionic-updates InRelease Hit:6 http://nyc2.mirrors.digitalocean.com/ubuntu bionic-backports InRelease Fetched 325 kB in 4s (92.9 kB/s) Reading package lists... Done Building dependency tree Reading state information... Done 4 packages can be upgraded. Run 'apt list --upgradable' to see them. root@do-u1804:~# apt upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following NEW packages will be installed: python3-ndg-httpsclient python3-requests-toolbelt The following packages will be upgraded: certbot python3-acme python3-certbot python3-certbot-apache 4 upgraded, 2 newly installed, 0 to remove and 0 not upgraded. Need to get 380 kB of archives. After this operation, 350 kB of additional disk space will be used. Do you want to continue? [Y/n] n Abort. root@do-u1804:~# apt-get update Get:1 http://mirrors.digitalocean.com/ubuntu bionic InRelease [242 kB] Hit:2 http://mirrors.digitalocean.com/ubuntu bionic-updates InRelease Hit:3 http://mirrors.digitalocean.com/ubuntu bionic-backports InRelease Get:4 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB] Hit:5 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease Hit:6 https://repos.sonar.digitalocean.com/apt main InRelease Fetched 325 kB in 3s (99.9 kB/s) Reading package lists... Done root@do-u1804:~# apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages have been kept back: certbot python3-acme python3-certbot python3-certbot-apache 0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
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