Author: Jeff

Try scp -O, e.g.:
scp -O -r -v source_files user@destination_server:/destination_folder

Set up a folder call ~/Documents/keys on the collector system

Using tmux-cssh, log in to all source systems.

On all source systems, enter:

tar -cvzf $HOSTNAME.tar.gz ~/.ssh/* && scp $HOSTNAME.tar.gz jeff@calypso:/home/jeff/Documents/keys

You should now have all systems (assuming that they could scp to the collector) listed in the keys folder, with the source hostname in the filename.

Debian/Ubuntu and other derivatives

sudo mkdir -p /etc/apt/keyrings

sudo wget -qO /etc/apt/keyrings/teams-for-linux.asc https://repo.teamsforlinux.de/teams-for-linux.asc

echo "deb [signed-by=/etc/apt/keyrings/teams-for-linux.asc arch=$(dpkg --print-architecture)] https://repo.teamsforlinux.de/debian/ stable main" | sudo tee /etc/apt/sources.list.d/teams-for-linux-packages.list

sudo apt update

sudo apt install teams-for-linux

RHEL/Fedora and other derivatives

curl -1sLf -o /tmp/teams-for-linux.asc https://repo.teamsforlinux.de/teams-for-linux.asc; rpm --import /tmp/teams-for-linux.asc; rm -f /tmp/teams-for-linux.asc

curl -1sLf -o /etc/yum.repos.d/teams-for-linux.repo https://repo.teamsforlinux.de/rpm/teams-for-linux.repo

yum update

yum install teams-for-linux

Download a theme from https://www.gnome-look.org/browse?cat=109&ord=latest

How to install a grub theme:

1. Extract the theme to /boot/grub/themes/
2. Edit /etc/default/grub file. Find the line starting with “#GRUB_THEME” and change it to “GRUB_THEME=/boot/grub/themes/[THEME_FOLDER]/[theme.txt]” (replace [THEME_FOLDER] ; [theme.txt] is probably OK ; remove “[]” brackets)
3. Run sudo update-grub

combined:

tar -cvzf - sourcefolder | gpg -c > zipfile.tar.gz.gpg

with password:

tar -cvzf - sourcefolder | gpg -c --batch --passphrase yourpassword >zipfile.tar.gz.gpg

snap-store --quit && sudo snap refresh snap-store
you might need to do:

sudo killall snap-store
sudo snap refresh snap-store

spaces to underscore:

find . -name "* *" -type d | rename -v -f 's/ /_/g'

find . -name "* *" -type f | rename -v -f 's/ /_/g'

change all to lowercase:

find . -depth -exec rename -v -f 's/(.*)\/([^\/]*)/$1\/\L$2/' {} \;

fix “-_” examples:

find . -name "*-_*" -type f | rename -v -f 's/-_/_/g'

sudo systemctl restart systemd-resolved

optional:

install nslookup and dig:

sudo apt install -y dnsutils

test:

nslookup google.com

dig google.com

Ubuntu Software aka Snap Store opens up essentially blank.

Close the Snap Store application

Open the terminal (Ctrl+Alt+T)

Type the command:

ps -ef|grep snap-store|grep -v grep

…to check if snap-store process is still running

If you get anything in the output, that indicates that snap-store is still running. The output may be like:

username 24225 1871 2 21:41 ? 00:00:23 /snap/snap-store/542/usr/bin/snap-store

in that case type the command

kill (number)

…where number is the first number shown in the line above, right after the username (in this case 24225)

repeat step 3 to confirm that snap-store is not running anymore

type the command:

snap-store

…and watch the output for “access denied” messages.

#########

On Ubuntu 20.04LTS the app called “Ubuntu software” is in reality snap-store (the terminal command running it is “snap-store”, not “gnome-software”). Ubuntu 20.04 does not seem to come with gnome-software installed by default. For me, closing the app, then typing

killall snap-store

in a terminal and then re-launching the app solved the problem without a reboot.

“Files” File manager (Nautilus) is not working on an Ubuntu system. Files either stops working, or won’t load at all.

try:

1. reinstalling nautilus-data using below command

sudo apt-get install --reinstall nautilus-data  ## this one worked in 22.04

2. terminating the running nautilus process

ps awx | grep nautilus
sudo kill (process ID) 

3. Uninstalling and reinstalling Nautilus

sudo apt-get remove nautilus

sudo apt-get autoremove
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install nautilus

rsync -Pavuc <source> <target>

What does it mean?

-P  --same as --partial --progress
-a, --archive archive mode; equals -rlptgoD (no -H,-A,-X)
-v, --verbose increase verbosity
-u, --update skip files that are newer on the receiver
-c, --checksum skip based on checksum, not mod-time & size

-a includes:

-r, --recursive recurse into directories
-l, --links copy symlinks as symlinks
-p, --perms preserve permissions
-t, --times preserve modification times
-g, --group preserve group
-o, --owner preserve owner (super-user only)
-D  --same as --devices --specials
      --devices preserve device files (super-user only)
      --specials preserve special files

To see all the fonts on a system:

fc-list |sort

Use Font Manager to import and organize fonts. Once you’ve installed them with FM you can delete the downloads.

Installed fonts are found in:

~/.local/share/fonts/

/usr/share/fonts/

/usr/share/texmf/

In this example, we’ll set up a 16Gb encrypted partition on a separate disk.

Note that this will wipe everything on your partition.

As root, use fdisk to determine which partition you want to use:

# fdisk -l

You could also use lsblk to show your installed drives:

# lsblk

In our case, we’re going to encrypt /dev/sde1, a 16GB USB stick.

First thing you need to do is to come up with a passphrase that you can remember.

Next, we’ll start the encryption process.

In our case, we want:

# cryptsetup -v luksFormat --type=luks2 /dev/sde1

Pay attention to the prompts.

You can check the man page for more options.

Now let’s open the encrypted volume, and give it a name for mapping the partition:

# cryptsetup open /dev/sde1 mypart

Next, give it a filesystem, using ext4:

# mkfs.ext4 /dev/mapper/mypart

Now create a mount point:

# mkdir /mnt/testenc

To mount the encrypted volume, you can use the cryptsetup with the mount command.

# cryptsetup --type luks open /dev/sde1 mypart

# mount -t ext4 /dev/mapper/mypart /mnt/testenc

To close the partition, do the following:

# umount /place/to/mount

# cryptsetup close mypart