Debian 8 jessie repo error

On a Debian 8 server, when running apt update, got following error

To fix it, run

Add following content to the file



apt – Problem unlinking the file auxfiles

When i get apt update on a Debian 9 server, i get following error

The problem is fixed by deleting

Install PowerShell in Debian 9

To install Microsoft PowerShell in Debian 9, run

Install GPG keys

Add repository

Install powershell

To start powershell, run

apt-key keyserver receive failed: No dirmngr

When running apt-key command, i get following error.

To fix this, run

apt install dirmngr

Install MongoDB 4 on Debian 9

You can see detailed instruction on how to install on MongoDB web site.

First add key

For Debian 8, run

For Debian 9, run

Now install mongoDB with

Once installed, you can check version with

Enable MongoDB start on boot

To start/stop mongodb

Install OpenLiteSpeed on Ubuntu/Debian

OpenLiteSpeed ia an Open Source version of LiteSpeed Web Server.

To install OpenLiteSpeed, add repository by running

Now you have openlitespeed packages available on your server. Here is packages available on a Debian 9 server.

OpenLiteSpeed Web Server

To install OpenLiteSpeed, run

OpenLiteSpeed will be installed in folder

You can start/stop OpenLiteSpeed using command

Once installed, you will be able to login to WebAdmin at

You can change default admin passord by going to

Admin > WebAdmin Settings > General > Users

Click on edit icon right side of user “admin”.

OpenLiteSpeed Change Admin Password

You can also change OpenLiteSpeed Admin password by running following command as user root

Ubuntu find Dependencies for a package

To find dependencies for a package, run


In above example, when you install php7.2, it install “libapache2-mod-php7.2”, that will install Apache web server. I had a server with ngtinx, when i install php7.2 package, apache get installed.

You can also use

To find reverse dependency, run

gpg: failed to start the dirmngr

When i add a key with apt-key command, i get error

[email protected]:~# apt-key adv –recv-keys –keyserver E1F958385BFE2B6E
Executing: /tmp/apt-key-gpghome.0BP6Ro2t54/ –recv-keys –keyserver E1F958385BFE2B6E
gpg: failed to start the dirmngr ‘/usr/bin/dirmngr’: No such file or directory
gpg: connecting dirmngr at ‘/tmp/apt-key-gpghome.0BP6Ro2t54/S.dirmngr’ failed: No such file or directory
gpg: keyserver receive failed: No dirmngr
[email protected]:~#

To fix this, run

Once installed, apt-key command worked properly.

[email protected]:~# apt-key adv –recv-keys –keyserver E1F958385BFE2B6E
Executing: /tmp/apt-key-gpghome.BLNQkuFGIQ/ –recv-keys –keyserver E1F958385BFE2B6E
gpg: key E1F958385BFE2B6E: public key “X2go Debian/Ubuntu Packaging ” imported
gpg: Total number processed: 1
gpg: imported: 1
[email protected]:~#

See Install x2go server in Debian 9