Check HDD SMART parameters in Ubuntu console

sudo apt install smartmontools

sudo fdisk -l

sudo smartctl --all /dev/sda

sudo smartctl --all /dev/sda1

sudo smartctl --all /dev/nvme0n1

JavaScript React Developer Tools

React Developer Tools extension for Chrome Browser

https://reactjs.org/docs/create-a-new-react-app.html

Build Samba 4.13.17 from source

sudo apt install cifs-utils - in case you need this fucntionality.

dpkg --get-selections | grep -v deinstall | grep samba

./configure

make -j6 depending on CPU cores

sudo make install

            Distutils not installed? Broken python installation? Get python-config now!

./configure --disable-python --without-ad-dc

            perl module Parse::Yapp::Driver 1.05

sudo apt install libparse-yapp-perl

            Jansson JSON support not found.

sudo apt install jansson-dev

sudo apt install libarchive-dev

            ACL support not found.

sudo apt install libacl1-dev

            LDAP support not found. Try installing libldap2-dev or openldap-devel.

sudo apt install libldap2-dev

            PAM support is enabled but prerequisite libraries or headers not found.

sudo apt install libpam0g-dev

sudo apt-mark hold samba

sudo apt-mark unhold $(apt-mark showhold)

https://wiki.samba.org/index.php/Package_Dependencies_Required_to_Build_Samba

https://wiki.samba.org/index.php/Build_Samba_from_Source

sudo nano /etc/samba/smb.conf

Linux chmod chown permissions table

user@PC:~$ sudo su

[sudo] password for user:

root@PC:/home/user#

Permission	Command Examples	Description
rwx rwx rwx	chmod 777 filename chmod -R 777 dir	Anybody can read, write, execute.
rwx rwx r-x	chmod 775 filename chmod -R 775 dir	Owner & Group can read, write, execute. Everyone else can read, execute.
rwx rwx r–	chmod 774 filename chmod -R 774 dir	Owner & Group can read, write, execute. Everyone else can read.
rwx r-x r-x	chmod 755 filename chmod -R 755 dir	Owner can read, write, execute. Everyone else can read, execute.
rwx — —	chmod 700 filename chmod -R 700 dir	Owner can read, write, execute. No one else has any rights.
rw- rw- rw-	chmod 666 filename chmod -R 666 dir	Everyone can read, write.
rw- rw- r–	chmod 664 filename chmod -R 664 dir	Owner & Group can read, write. Everyone else can read.
rw- r– r–	chmod 644 filename chmod -R 644 dir	Owner can read, write. Everyone else can read.

root@PC:/home/user# exit

exit

user@PC:~$

Running chmod -R 777 / as root will break your system.

https://www.linode.com/docs/guides/modify-file-permissions-with-chmod/

sudo find / /boot -xdev ! -type s -printf 'chmod %m %p\n' -printf 'chown %u:%g %p\n'

Complete list of default GNU/Linux file permissions as found in Ubuntu Server 16.10 Yakkety Yak with all roles => https://www.vidarholen.net/contents/junk/ubuntu_permissions.html

How to restore root directory permission to default? https://askubuntu.com/questions/958141/fix-permissions-of-server-after-accidental-chmod

sudo adduser user group

sudo deluser user group

groupadd [OPTIONS] GROUPNAME

groupdel [OPTIONS] GROUPNAME

Krusader and Dolphin do not open iso zip 7zip

Dolphin: Ctrl+ Shift + , => Navigation => Open archives as folder.

Krusader: Ctrl+ Shift + , => Archives => Open Archives As Folders.

Krusader: No permission to zip into certain folder.

sudo apt reinstall zip unzip

Failed to pack /media/user/sda1/archive.zip. ied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied 

dpkg --get-selections | grep -v deinstall | grep zip

bzip2                                           install

bzip2-doc                                       install

gzip                                            install

libminizip1:amd64                               install

libzip4:amd64                                   install

p7zip                                           install

p7zip-full                                      install

p7zip-rar                                       install

python3-zipp                                    install

unzip                                           install

zip                                             install

Discover > Dolphin - Dolphin Plugins to get Mount ISO in right click menu.

Bug with ISO mount - some ISOs appear under Devices after Dolphin restart.

Kubuntu 20.04 solution that may not work:

/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/kio_krarc.so

/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/kio_iso.so

sudo cp kio_iso.so kio_krarc.so /usr/lib/x86_64-linux-gnu/qt5/plugins

Slow boot after swap change on Ubuntu 20.04

Ctrl + Alt + T

sudo pico /etc/fstab

sudo blkid

Create SSD disk image & restore with dd on Ubuntu

Boot from Kubuntu Live USB flash drive.

Choose "Try Kubuntu".

*I deleted Swap partition with KDE Partition Manager just in case.

Ctrl + Alt + T