cl-netbox's questions

I am running Ubuntu 16.10 with snapd and the basic core snap installed since it was released.
After some time I observed that the /snap/core directory fills up with multiple older versions.
To remove them I'll have to execute sudo snap remove core --revision <number> manually.

Multiple versions of snaps & garbage collection section in Snaps and snapcraft documentation explains that after every update of a snap package the current version and the one before are installed and older versions are getting automatically removed (just as it was earlier the case).

As I cannot find further information in snap help, I am asking whether there is a setting or a switch command in snapd to enable automatic removal of those older core snap packages.
Additional information : What I described is valid for 3 machines with the same configuration.

I am running Ubuntu Server 16.04.1 with Landscape On-Premises 16.06 installed and 3 computers are attached. Since a few days the update security script is not running anymore, everything else works as expected. To make sure that there is nothing wrong with my setup, I performed a new installation from scratch. The issue remains, I am receiving the permanent alert that the script update_security_db.sh did not run - actually it never ran since the fresh installation at all.

This is the error information I get from /var/log/landscape-server/update-security-db.log :

Sep  1 19:15:08 update-security-db ERR  Unhandled error in Deferred:
Sep  1 19:15:08 update-security-db ERR
Sep  1 19:15:08 update-security-db ERR
Sep  1 19:15:08 update-security-db ERR  Traceback (most recent call last):
Sep  1 19:15:08 update-security-db ERR  Failure: txamqp.client.Closed: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was los$
Sep  1 19:15:08 update-security-db ERR  ]

The attempt trying to run the update_security_db.sh script as landscape user manually failed.
(sudo -u landscape bash -x /opt/canonical/landscape/scripts/update_security_db.sh)

All attached computers (1 server and 2 workstations) are having the latest available updates installed. What is the root cause and what has to be done to make it running properly again ?

I am running Landscape On-Premises (version 16.06) on Ubuntu Server 16.04. When I connect to the server via the web interface, everything is working as expected. Additionally I installed and configured the landscape-api package to manage the server via ssh. When I use landscape-api as described in the Landscape API documentation, nothing usable returns from given commands :

source /home/cl/landscape-api.rc

landscape-api get-activities
No JSON object could be decoded

landscape-api get-computers
No JSON object could be decoded

landscape-api get-event-log
No JSON object could be decoded

landscape-api --json get-activities
Query API Service

landscape-api --json get-computers
Query API Service

landscape-api --json get-event-log
Query API Service

I am running Landscape On-Premises (version 16.06) on Ubuntu Server 16.04. The activities and the event tabs are filling up with the same entries every day. I am not able to delete any entries from the web interface. Via ssh I deleted relevant log files in the /var/log directory of the server but all activities and the event logs are still present when I login to the Landscape web interface.

I already got the information that the logs are supposed be an auditable log and so intentionally are meant to be not clearable. How can I nevertheless remove the activities and the event logs ? Where are the log files located and how can I manipulate them to clean up the server interface ?

Update : Results from the attempt to remove and reinstall postgresql and landscape-server

The solution to purge and reinstall postgresql generally worked, but after re-installing and re-registering account and computers, the computers were not able to ping the Landscape Server.

The solution to purge and reinstall landscape-server did not work - I got an error, which I was not able to solve, also I could not access Landscape Server at all anymore -> screenshots below.

I need to add that I did not run sudo apt autoremove after the removal - because this would have been a complete re-installation, which is too much effort for only clearing the event log.

My computer has UEFI based BIOS and I want to start over from scratch.

The PC came with Windows installed - I later installed Ubuntu alongside.

I want to completely re-build my whole disk and install only Ubuntu on it.

So it is not about how to install Ubuntu, it is about how to prepare a disk.

What is the most professional way and which tasks will I have to perform?

After discharging the battery completely, my notebook suspends instead of shutting down.
That happens regardless of using intel graphics or NVIDIA graphics mode on ubuntu 15.04.

Can this issue be kernel (3.19) related? Power behavior in ubuntu 14.10 (3.16) was correct.
To prevent the battery from getting damaged it is important that the machine shuts down.

As hibernation is disabled by default and not selectable in system settings, I wonder why -
power section in system settings is configured to power off the laptop - how can I fix this?

Hardware specifications:

• SCHENKER XMG Advanced (CLEVO based) notebook series

• i7-4710MQ | 16GB RAM | GTX 860M | 250GB SSD | 1TB HDD

• intel Wireless AC-7260 + Bluetooth | 77 Wh Lithium battery

• Hybrid graphics intel HD 4600 & NVIDIA GeForce + Optimus

GPU driver information:

• nvidia-* (current stable) from Proprietary GPU Drivers PPA

Output from gsettings:

$ gsettings get org.gnome.settings-daemon.plugins.power critical-battery-action
shutdown