====== Ubuntu tips ======
===== 20.04 post-install steps =====
  * install VBox guest additions
<code>
# apt install gcc make perl
# /media/hanys/VBox_GAs_6.1.18/VBoxLinuxAdditions.run
# reboot
</code>
  * install and configure additional software
<code>
# apt install net-tools openssh-server vim tmux mc autofs
# vim /etc/idmapd.conf          Configure nfs4 domain
# vim /etc/auto.master          Uncomment /net/ line
# service autofs restart
</code>
  * create dxxx user account (plus related groups) and set up the account
<code>
# groupadd -g 501 dxx
# groupadd -g 508 gr_share
# useradd -c "J..." -g dxxx -G adm,cdrom,dialout,sudo,dip,plugdev,lpadmin,lxd,sambashare,vboxsf,gr_share \
  -m -s /bin/bash -u 501 dxxx
# passwd dxxx
</code>
  * copy dxxx's config from the server
<code>
$ scp -r .ssh <vb-ubuntu>:~/
$ scp -r .tmux <vb-ubuntu>:~/
$ scp .tmux.conf .bash_aliases <vb-ubuntu>:~/
</code>
  * configure dxxx's account
<code>
$ cd ~
$ mv Documents/ Documents.local
$ ln -s /net/192.168.1.2/data/smb/users/dambi/Documents
$ ln -s /net/192.168.1.2/data/smb/users/dambi/projects
</code>
===== Allow users with UID < 1000 appear on login screen =====
By default users with UID lesser than 1000 do not appear on graphical login screen. That can be changed in **/etc/login.defs** file by customizing **UID_MIN**, **GID_MIN** settings. \\
\\
//Note: Does not seem to work on 18.04.//
===== Enable auto login for user with UID < 1000 on 18.04 =====
<code>
$ sudo vim /etc/gdm3/custom.conf
...
# Enabling automatic login
AutomaticLoginEnable=true
AutomaticLogin=userid
...
</code>
===== Convert JPG to PDF =====
<code>
$ img2pdf image.jpg > image.pdf
</code>
===== Resize JPG =====
==== in nautilus ====
Install necessary packages and restart nautilus...
<code>
$ sudo apt install imagemagick
$ sudo apt install nautilus-image-converter
$ nautilus -q
</code>
Resize image via right mouse click...
==== CLIs ====
<code>
$ man mogrify
$ man convert
</code>