Some settings I find useful for a workstation

CPU monitoring on the main panel

Default Ubuntu desktop seems to become finally convenient enough for me starting from Ubuntu 18.04. Only several tweaks are missing. Constantly available CPU/Mem/HDD/Network monitor is one of them. Here is how to install a small widget for a top panel in the default GNOME desktop environment.

  1. sudo apt-get install gir1.2-gtop-2.0 gir1.2-networkmanager-1.0 gir1.2-clutter-1.0

  2. Go to Ubuntu Software and then search for system monitor extension. Install one named system-monitor:

    Display system information in GNOME Shell status bar

  3. After the installation you should see a new applet in the main pannel. One can find settings in the context menu.

Desktop, workspaces and gnome extensions settings in Ubuntu 18.04

only show applications of current workspace in launcher:

sudo apt install dconf-editor

Navigate to org > gnome > shell > extensions > dash-to-dock and check isolate-workspaces

Show workspace indicator in the main pannel

Enable “Workspace Indicator” extension.

extensions settings in ubuntu 18

Static number of workspaces

workspaces settings in ubuntu 18

Showing windows instead of notification “window is ready”

Install extension noannoyance

or use dconf:

show window insread of notification window is ready

Align windows to the corners or sides of the screen

Default settings allow only alignment to the sides and full screen. To align windows to the corners I use Put windows gnome extension.

Autocomplete in shell

See autocomplete from history in terminal

Set nemo as default file manager

xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search

now if you run xdg-open ./ or press Super+E nemo starts.

source

Auto completion for fabric

Add

have fab && {
_fab_completion()
{
    COMPREPLY=() 
    local cur tasks
    tasks=$(fab --shortlist 2>/dev/null)
    _get_comp_words_by_ref cur
    COMPREPLY=( $(compgen -W "${tasks}" -- ${cur}) )
}
complete -F _fab_completion fab
}

to ~/.bash_completion.

Source

Default permissions for directories

By default when you call mkdir abc the following permissions are created

u=rwx,g=rx,o=rx

That means that other users, also other groups, will be able to read and execute your files. That is a legacy setting. you can change it by replacing

UMASK       002

with

UMASK       077

in file /etc/login.defs. Here is the quote from this file:

# UMASK is the default umask value for pam_umask and is used by
# useradd and newusers to set the mode of the new home directories.
# 022 is the "historical" value in Debian for UMASK
# 027, or even 077, could be considered better for privacy
# There is no One True Answer here : each sysadmin must make up his/her
# mind.
#
# If USERGROUPS_ENAB is set to "yes", that will modify this UMASK default value
# for private user groups, i. e. the uid is the same as gid, and username is
# the same as the primary group name: for these, the user permissions will be
# used as group permissions, e. g. 022 will become 002.

Useful for server setup

Appearance customization

Ubuntu freezes when RAM is full

(DRAFT, from https://habr.com/en/company/selectel/blog/498526/ )

Кстати, никто не подскажет как вылечить зависание ubuntu при заполнении RAM?

SergeyD
today at 07:27 PM

+1

Включить и настроить swap
Включить использование zswap: https://wiki.archlinux.org/index.php/Zswap
Установить и настроить earlyoom — осторожно, может прибить все процессы

ValdikSS today at 08:16 PM

+2 1. Установить и настроить zram, проще всего через zram-tools. 2. Создать /etc/sysctl.d/60-dirty.conf со следующим содержимым:

vm.dirty_bytes = 67108864 vm.dirty_background_bytes = 16777216

vm.swappiness=100 vm.watermark_scale_factor=200

  1. Убедиться, что используется достаточно свежее ядро (5.3+).

Эти три пункта заметно улучшают ситуацию. Если еще полтора года назад, во времена 4.19, я бы однозначно советовал Windows 10 для маломощных компьютеров с малым количеством RAM, то с параметрами, описанными выше, я ошибся с копированием файла, скопировав многогигабайтный файл в RAM целиком, и система только немного замедлилась. Также могу запускать несколько виртуалок одновременно, RAM в настройках которых превышает количество физически установленной памяти, и все также, не побоюсь этого слова, быстро работает, при 5+ ГБ в swap (и zram, и zswap).