Questions tagged [ubuntu]

Ubuntu Linux is a Debian derivative that aims to bring Linux mainstream. Questions on this site should generally refer to Ubuntu Server. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.

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Should I remove almost all users in Ubuntu?

I want to defend my ubuntu server from unauthorized logins. I have an all users list. There are a lot of users. You can see a list on screenshot. Should I remove all the users except mine? I want to ...
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Wordpress multisite subdomain resolution

I have a Wordpress multisite (I am using Apache 2.4 on an Ubuntu 20.04 server on AWS). The structure is a main site -- say mainsite.com -- and three subdomains: aaa.mainsite.com bbb.mainsite.com ccc....
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Can't find my network printer

I have a Canon TS6350 and Lubuntu 18.04. I was able to install the official drivers and print over USB. I have also successfully connected the printer to the router over the wifi, on address 192.168....
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Ansible server can't ssh to CentOS 8 machine through -m ping

Currently i'm working on an Ansible server that has 4 hosts (3Ubuntu and one CentOS). I can SSH to them without problems. But when i try to run: ansible servers -m ping this wel be the output: [email protected]
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Fail2ban not banning ip address

I installed fail2ban on a Ubuntu 20.04 server. I've followed some articles on how to configure it but it doesn't work. I've made 10 incorrect login attempts and still didn't get banned. /etc/fail2ban/...
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Cannot access guest webserver from host

Here is my configuration, I have a Ubuntu 20.04 host machine with a kvm virtual machine holding a webserver. I set the folowing rules with iptables in order to root the ports 80 and 443 of the host ...
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13 views

How to drop dhcp ip assignated when using clevis/tang on Ubuntu 20.04

I unlock my drive with clevis/tang on an Ubuntu server (NBDE). It works fine, but even if my server is configured to use a static ip in /etc/netplan/01-netcfg.yaml, my network interface also listen on ...
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Ubuntu Server 20.04 freeze/unresponsive, kernel BUG: Bad page state in process

Server Information: Distributor ID: Ubuntu Description: Ubuntu 20.04.1 LTS Release: 20.04 Codename: focal today I noticed my new Server crashed/froze. It did not accept any ssh ...
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17 views

Postfix - Can Send / Receive Localy - Send External - Not receive from external

I just finish configuring my own mail server using this guide: LinuxBabe Guide At the start all was working but now I can not receive mail from external. Here is my configuration file: https://hatebin....
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Ubuntu 20.04 Modoboa: dovecot.service failed, and Error: Connection to IMAP server failed: [Errno 111] Connection refused

Impacted versions Distribution: Ubuntu 20.04 Arch: 32 Bits Database: PostgreSQL Steps to reproduce Installed Modoboa through the installer. (didn't saw any errors) Installed SSL certificate through ...
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Wireguard VPN can't access internet and LAN

I have a server running Ubuntu 20.04 and wireguard 1.0.20200513-1~20.04.2. I installed the wireguard app on my phone (Android Samsung S20+) and disabled WIFI and connected to 4G. When the VPN is ...
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73 views

Server not accessible from the internet despite everything

I don't have a static ip, so it changes sometimes, meaning I have to change things like port forwarding rules for my web server and SSH, etc. However this time, despite everything, it's not accessible ...
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SSH/SCP with public key AND password authentication SIMULTANEOUSLY

The server I'm attempting to SCP a file to requires BOTH a password AND a public/private key. I'm trying to send the file from Ubuntu but I can only get scp to use either key OR password, but not both....
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57 views

Ubuntu 20.04 update destroyed Java/Mysql app performance

I'm working on a Java / MySQL app and test runs of batch processing were taking 3-4seconds on Ubuntu 18.04. I made the upgrade to Ubuntu 20.04 last night, and kept the same mysql conf file, and now ...
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automatic SSH login with ssh key's dont work after sudo

I have an Ansible server with 3 ubuntu servers (hosts). So i want to be able to logon to those servers by typing in the SSH key password once. I have edited my .bashrc with an alias. alias ssha='eval $...

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