In Ubuntu 21.04 Home folder are no longer ‘world-readable’ by default. Or to be explicitly technical, the directory permissions have changed from 755 to 750.

Icon themes in screenshot are:
Boston icon theme https://www.gnome-look.org/p/1012402/
Ozon icon theme https://github.com/ozonos/ozon-icon-theme/tree/master/Icons

ow graphics mode should enable itself when it detects certain GL features are not available but there are times when you might want to force it on.  Here’s how you can force low graphics mode on 16.04 LTS (Xenial) :

   nano ~/.config/upstart/lowgfx.conf
   Paste this into it:

start on starting unity7
pre-start script
   initctl set-env -g UNITY_LOW_GFX_MODE=1
end script

   Log out and back in

If you want to stop using low graphics comment out the initctl line by placing a ‘#’ at the start of the line.

This won’t work in 16.10 Yakkety because we’re moving to systemd for the user session.  This will be fixed in due course.

#!/bin/bash

GS="/usr/bin/gsettings"
CCUL="com.canonical.Unity.lenses"

# Figure out the version of Ubuntu that you're running
V=$(/usr/bin/lsb_release -rs)
# The privacy problems started with v12.10, so earlier versions should do nothing

# Added check because 14.04.1 isn't a number
if [ $V == "14.04.1" ]; then
 $V=14.04
fi

# Minimum version check
MIN=`echo $V'>'12.10 | bc -l`

# Maximum version check
FIXED_VER=15.04
MAX=`echo $FIXED_VER'>'$V | bc -l`

if [[ $MIN -eq 0 || $MAX -eq 0 ]]; then
 echo "Good news! This version of Ubuntu is not known to invade your privacy."
 exit 0    # The script should exit if Ubuntu version is outside of range
fi

# Check if Canonical schema is present. Take first match, ignoring case.
SCHEMA="$($GS list-schemas | grep -i $CCUL | head -1)"
if [[ -z "$SCHEMA" ]]
 then
 printf "Error: could not find Canonical schema %s.\n" "$CCUL" 1>&2
 exit 1
else
 CCUL="$SCHEMA"
fi

# Turn off "Remote Search", so search terms in Dash aren't sent to the internet
$GS set "$CCUL" remote-content-search none

# If you're using a version earlier than v13.10, uninstall unity-lens-shopping
if [[ $V < 13.10 ]]; then
 sudo apt-get remove -y unity-lens-shopping

# If you're using a later version, disable remote scopes
else
 $GS set "$CCUL" disabled-scopes \
   "['more_suggestions-amazon.scope', 'more_suggestions-u1ms.scope',
   'more_suggestions-populartracks.scope', 'music-musicstore.scope',
   'more_suggestions-ebay.scope', 'more_suggestions-ubuntushop.scope',
   'more_suggestions-skimlinks.scope']"
fi;

# Block connections to Ubuntu's ad server, just in case
if ! grep -q "127.0.0.1 productsearch.ubuntu.com" /etc/hosts; then
 echo -e "\n127.0.0.1 productsearch.ubuntu.com" | sudo tee -a /etc/hosts >/dev/null
fi
# Editing /etc/hosts is OK, but adding an iptables rule seems to be
# a more elegant solution
sudo iptables -A OUTPUT -d 91.189.92.11 -j REJECT

echo "All done. Enjoy your privacy."