You may receive the Error updating runtime
response in Flatpak when trying to update one or all of your installed Flatpak applications. There is usually a trivial fix for this error, as Flatpak includes serveral ways to help users troubleshoot the root cause and apply a fix. In this tutorial, we will take you through the step by step instructions to resolve the Error updating runtime
error message in Flatpak on a Linux system.
error
How to fix the Permission denied error in Flatpak
The Permission denied
error message in Flatpak may occur whenever Flatpak runs into some trouble either with installing or updating an application. This error usually indicates that the current user does not have the correct permissions to install or update an application, and can usually be fixed with sudo
command or the --user
option. In this tutorial, we will explore several causes of the Permission denied
error in Flatpak, and help you resolve it on your Linux system to get Flatpak working as intended once more.
httpd: apr_sockaddr_info_get() failed on RHEL
When running an Apache web server on Red Hat Enterprise Linux, you may encounter the error AH00557: httpd: apr_sockaddr_info_get() failed
or AH00558: httpd: Could not reliably determine the server's fully qualified domain name
when trying to start the service. In this tutorial, we will look into the cause of this error and give you a solution for fixing it.
Sendmail: “unqualified hostname unknown; sleeping for retry unqualified hostname
If you have configured Sendmail on your Linux system and are still unable to send emails because of a unqualified hostname
error, we have a few suggestions that you can use to try and remedy the issue.
Bash – Redirect both standard output and standard error to same file
The Bash shell is the most popular shell on Linux systems, and to use the shell efficiently, you need a little knowledge about Bash shell redirections. This is also an essential step in learning Bash scripting.
In this guide, we’ll show how to redirect standard output and standard error to the same file on the Bash shell command line. This will include several examples so you can pick the right method in any scenario.
In this tutorial you will learn:
- How to redirect standard output and standard error to same file
- How to redirect standard output and standard error to file and terminal
- How to redirect standard output and standard error to /dev/null
routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
Symptoms
Unable to connect to SMTP server using PHP and OpenSSL. The following related error messages may appear as part of troubleshooting output:
PHP Warning: fsockopen(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed PHP Warning: fsockopen(): Failed to enable crypto PHP Warning: fsockopen(): unable to connect to ssl PHP User Warning: Unable to connect to SMTP server
How to disable NGINX logging on Linux system
The default configuration of Nginx webserver logging system is to log both access and error logs for all enabled sites into /var/log/nginx/access.log
and /var/log/nginx/error.log
respectively. This default behaviour is set by the following directives found within /etc/nginx/nginx.conf
configuration file:
access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log;
Moodle – Exception – Call to undefined function xml_parser_create()
Symptoms
The following error message occurs during moodle upgrade attempt whether it be on command line or admin back end:
# php moodle/admin/cli/upgrade.php Default exception handler: Exception - Call to undefined function xml_parser_create() Debug: Error code: generalexceptionmessage * line 76 of /lib/xmlize.php: Error thrown * line 307 of /lib/environmentlib.php: call to xmlize() * line 355 of /lib/environmentlib.php: call to load_environment_xml() * line 101 of /lib/environmentlib.php: call to get_latest_version_available() * line 116 of /admin/cli/upgrade.php: call to check_moodle_environment() !!! Exception - Call to undefined function xml_parser_create() !!! !! Error code: generalexceptionmessage !! !! Stack trace: * line 76 of /lib/xmlize.php: Error thrown * line 307 of /lib/environmentlib.php: call to xmlize() * line 355 of /lib/environmentlib.php: call to load_environment_xml() * line 101 of /lib/environmentlib.php: call to get_latest_version_available() * line 116 of /admin/cli/upgrade.php: call to check_moodle_environment() !!
RHEL7 FTP server error: ftp: connect: No route to host solution
When setting up FTP server on Redhat 7 Linux box the following error message ftp: connect: No route to host
may pop-up during FTP client session:

Installation of missing php-mbstring on RHEL 7 Linux
The php-mbstring
is part of Redhat’s server optional packages. If you have a current subscirption all you need to do is to enable this repository using:
[root@rhel7 ~]# subscription-manager repos --enable=rhel-7-server-optional-rpms
and use yum to install php-mbstring
. In case that you do not have a current Redhat subscription you can install php-mbstring
directly from IUS project repository:
[root@rhel7 ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/7/x86_64/ius-release-1.0-13.ius.el7.noarch.rpm [root@rhel7 ~]# wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm [root@rhel7 ~]# rpm -Uvh *release*.rpm
How to Fix Grub error: no such partition Grub Rescue
Grub is a boot loader for many Linux distributions which basically tells your system where it can find installed operating system(s) on one or more hard drives. Your PC needs this information in order to boot into your Linux distro successfully. If grub becomes corrupted, one such error you may come across is “error: no such partition grub rescue.”
This error most commonly arises when resizing or rearranging the partitions of a hard drive, as is necessary with dual boot in Ubuntu or dual boot in Manjaro, for example. If you’ve received this error out of the blue (i.e. you haven’t made any recent changes to your hard drive), it could be a sign of the hard drive going bad.
Regardless of the cause, we’ve written this guide to help you get your Linux system back up and running. In this article, we’ll give you the step by step instructions to fix the dreaded “no such partition” grub error.
In this tutorial you will learn:
- How to fix grub error: no such partition grub rescue
Kali Linux – Failed to fetch InRelease – Repository Fix
Symptoms
Unable to use standard Kali Linux provided repository for updating the Kali Linux system as well for new software installations.
The following error message appears when attempting to run the apt update
command:
Err:1 http://http.kali.org/kali kali-rolling InRelease 403 Forbidden [IP: 192.99.200.113 80] Reading package lists... Done E: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease 403 Forbidden [IP: 192.99.200.113 80] E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.