While running Ubuntu 18.04.1 on a laptop, the following errors were observed.
mce: hardware error cpu 0 machine check 0 bank 6 ae0000000040110a mce: hardware error tsc 0 addr ffb07540 misc 238a0000086 mce: hardware error processor 0:40651 time 1540082330 socket 0 Apic 0 microcode 24 ipmi dmi invalid offset 0
The system would stop in the single user mode.… Read more
While configuring a Linux server, the error
Failed to fetch webpage, temporary failure resolving domain was observed.
$ sudo apt-get update Err:1 ... bionic InRelease Temporary failure resolving ... Err:2 ... bionic-updates InRelease Temporary failure resolving ... ... Reading package lists...… Read more
After updating the Drupal 7 version in a website, the following error was observed in the configuration of the Composer Manager module.
Composer Manager: Composer's install command must be run to generate the autoloader and install the required packages.… Read more
After updating the website to a new version of Drupal 7, the following error was printed on the web pages.
Notice: Trying to get property of non-object in block_block_view() (line 247 of modules/block/block.module).
The error was resolved by the following steps.… Read more
Dovecot: Fatal: Error in configuration file /etc/dovecot/dovecot.conf: protocols: Unknown protocol: sieve
While configuring the Dovecot Mail Delivery Agent, the Dovecot server would not start and the following error messages were printed.
$ sudo systemctl start dovecot Job for dovecot.service failed because the control process exited with error code. See "systemctl status dovecot.service"… Read more
While executing the dig command, the
sendmsg() failed: Operation not permitted error was printed.
$ dig example.com ../../../../lib/isc/unix/net.c:581: sendmsg() failed: Operation not permitted ../../../../lib/isc/unix/net.c:581: sendmsg() failed: Operation not permitted ...
The error was resolved after adding the following iptables rules.… Read more
A signed APK of an Android app was built using the Android Studio. When we tried to download the signed APK to a device using the adb command, the command failed with the error, INSTALL_PARSE_FAILED_NO_CERTIFICATES.
$ adb install app-release.apk… Read more
While running optipng on a png file, the following error was obtained,
Error: Can't back up the existing output file
The file was not having the write permission. Once, the write mode bit for the file was set, optipng worked fine.… Read more