can't set the locale; make sure $LC_* and $LANG are correct

 /etc/locale.gen

uncoment  

  en_GB.UTF-8
  en_US.UTF-8


run locale-gen as root

 

 

Virtualbox: two network interfaces

 I had to add the following lines in Debian virtual machine's /etc/network/interfaces file:

allow-hotplug eth1
iface eth1 inet dhcp

The second line instructs the interface to obtain an IP via DHCP. The first line loads the interface at boot time.

To apply the changes to a running system, invoke:

ifup eth1

The name for the eth1 interface may vary, use ifconfig -a to list all available interfaces.

EDIT: full /etc/network/interfaces:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

allow-hotplug eth1
iface eth1 inet dhcp

How to install ZOOM on Ubuntu 20.04.2 LTS

•  sudo apt-get upgrade
• sudo snap install zoom-client

Uninstall flatpak

1. sudo apt install flatpak 

2. flatpak uninstall --all 

3. sudo apt purge --autoremove flatpak

4. Check directory /var/lib/flatpak should be everything removed.

Ubuntu 20.04 problem with headphone?

 

Step 1. pulseaudio --kill
Step 2. pulseaudio --start
Step 3. Settings->Sound->Output devices->Headphones

How to burn a Windows .iso to a USB device in Ubuntu?

 Step 1.   Download Windows10

https://www.microsoft.com/pl-pl/software-download/windows10ISO

Step 2.   Check where is mounted your usb stick.

sudo    fdisk -l

Step 3. Run command:

sudo dd bs=4M if=[path to windows iso] of=/dev/sd[that 1 letter]

Securely erasing storage device

 Shred - overwrite data on a whole device with random bits.

1. Identify the name of the device

        fdisk -l     

 

Disk /dev/sdc: 931,53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: SAMSUNG HD103SJ
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes 

 

2.  Execute command::

                 

    sudo shred -v -n1 -z /dev/sdX

 

    -v flag is verbose and will print  the current progress

    -n1 overwrite blocks on the device "n1" times

    -z set all bits to zero after the last iteration

 

 

 ....

shred: /dev/sdc: pass 2/2 (000000)...920GiB/932GiB 98%
shred: /dev/sdc: pass 2/2 (000000)...921GiB/932GiB 98%
shred: /dev/sdc: pass 2/2 (000000)...922GiB/932GiB 98%
shred: /dev/sdc: pass 2/2 (000000)...923GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...924GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...925GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...926GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...927GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...928GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...929GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...930GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...931GiB/932GiB 99%
shred: /dev/sdc: pass 2/2 (000000)...932GiB/932GiB 100%