DEV: update Ubuntu/Debian installation instructions (#568)

* DEV: update Ubuntu/Debian installation instructions

* Apply changes per Yossi's review

Author: dwdougherty

content/operate/oss_and_stack/install/install-redis/_index.md

@@ -20,11 +20,11 @@ While you can install Redis on any of the platforms listed below, you might also
 
 How you install Redis depends on your operating system and whether you'd like to install it bundled with Redis Stack and Redis UI. See the guide below that best fits your needs:
 
-* [Install Redis from Source]({{< relref "/operate/oss_and_stack/install/install-redis/install-redis-from-source" >}})
 * [Install Redis on Linux]({{< relref "/operate/oss_and_stack/install/install-redis/install-redis-on-linux" >}})
 * [Install Redis on macOS]({{< relref "/operate/oss_and_stack/install/install-redis/install-redis-on-mac-os" >}})
 * [Install Redis on Windows]({{< relref "/operate/oss_and_stack/install/install-redis/install-redis-on-windows" >}})
 * [Install Redis with Redis Stack]({{< relref "/operate/oss_and_stack/install/install-stack/" >}})
+* [Install Redis from Source]({{< relref "/operate/oss_and_stack/install/install-redis/install-redis-from-source" >}})
 
 Refer to [Redis Administration]({{< relref "/operate/oss_and_stack/management/admin" >}}) for detailed setup tips.
 

content/operate/oss_and_stack/install/install-redis/install-redis-on-linux.md

@@ -14,7 +14,13 @@ Most major Linux distributions provide packages for Redis.
 
 ## Install on Ubuntu/Debian
 
+Add the repository to the APT index, update it, and install Redis:
+
 {{< highlight bash  >}}
+sudo apt-get install lsb-release curl gpg
+curl -fsSL https://packages.redis.io/gpg | sudo gpg --dearmor -o /usr/share/keyrings/redis-archive-keyring.gpg
+sudo chmod 644 /usr/share/keyrings/redis-archive-keyring.gpg
+echo "deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/redis.list
 sudo apt-get update
 sudo apt-get install redis
 {{< /highlight  >}}

content/operate/oss_and_stack/install/install-stack/linux.md

@@ -15,9 +15,10 @@ Learn how to install Redis Stack on Linux from the official APT repository or RP
 ## From the official Ubuntu/Debian APT Repository
 
 See [this page](https://redis.io/downloads/#redis-stack-downloads) for a complete list of supported Ubuntu/Debian platforms.
-Add the repository to the apt index, update it, and install Redis Stack:
+Add the repository to the APT index, update it, and install Redis Stack:
 
 {{< highlight bash >}}
+sudo apt-get install lsb-release curl gpg
 curl -fsSL https://packages.redis.io/gpg | sudo gpg --dearmor -o /usr/share/keyrings/redis-archive-keyring.gpg
 sudo chmod 644 /usr/share/keyrings/redis-archive-keyring.gpg
 echo "deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/redis.list