1.0 Error The vi editor in Ubuntu Linux distribution is not showing color syntax highlighting in the edit window. 2.0 Solution vi is one of the original text editors of the UNIX operating system offering full screen text editing with excellent cursor movement, navigation, search, edit, copy, cut and paste capabilities. The equivalent program under …
vi not showing color syntax highlighting in Ubuntu Linux Read More »
1.0 Error Wacom tablet connected to a laptop Wacom One CTL-672/KO-CX tablet was not connecting with a laptop running Ubuntu Linux 18.04 LTS. It was working fine earlier, with the wacom driver obtained from the Linux Wacom Project. The Linux kernel on the laptop had been updated recently. The following error messages were observed. $ …
Wacom One CTL-672/KO-CX is an 8.5 inch x 5.3 inch graphic tablet which can be connected to a computer via a USB port. The tablet comes with a pressure sensitive cordless pen. Once connected to a computer via a USB port, pen and tablet work like a mouse on a mouse pad, giving a very …
Connecting Wacom One CTL-672/KO-CX tablet to Ubuntu Linux Read More »
1.0 Error 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 …
1.0 Introduction systemd is the newer init system used in most Linux distributions since 2015. The first widely used init system was the System V init process, sysvinit. Ubuntu introduced the Upstart init system with Ubuntu 6.10 in 2006. Ubuntu fully migrated to systemd with Ubuntu 15.04 in 2015. Indeed, we can see that /sbin/init …
1.0 Syslog Syslog is a protocol for conveying event notification messages. Syslog was first developed by Eric Allman for logging as a part of the Sendmail project in the 1980s. It soon became a de-facto standard for logging on Unix-like systems. Syslog was formally specified in RFC 3164 in 2001 as “The BSD syslog Protocol” …
D-Bus is a mechanism for interprocess communication for Linux systems. D-Bus concepts along with example client-server programs are explained.
1.0 last and lastb The last command gives a chronological list of user logins in a Linux system for a period of time. The lastb commands gives a similar list of failed logins to the system. By default, last uses the /var/log/wtmp file for the record of login data. Similarly, lastb, by default, reads the …
Find user login history – last and lastb commands in Linux Read More »
While configuring mail on a Ubuntu Linux server running the Postfix mail server and Dovecot IMAP server, the following errors were observed in the mail log files, dovecot: imap(user1): Error: open(/var/mail/user1) failed: Permission denied (euid=1002(user1) egid=1002(user1) missing +w perm: /var/mail, we’re not in group 8(mail), dir owned by 0:8 mode=0775) dovecot: imap(user1): Error: Failed to …
Dovecot: imap Error: open (/var/mail/username) failed Read More »
1.0 tmpfs tmpfs is a filesystem that resides in the main memory of a Linux system. tmpfs stands for temporary file system. In the case of disk files, a file is first fetched into the kernel pagecache and the delivered to the requesting process. The fetch part is not there in the case of tmpfs …
