Fix typo in `install-ubuntu.md`

Closes #5100.

PiperOrigin-RevId: 195078092
diff --git a/site/docs/install-ubuntu.md b/site/docs/install-ubuntu.md
index 1ed93b5..c9f9cb20 100644
--- a/site/docs/install-ubuntu.md
+++ b/site/docs/install-ubuntu.md
@@ -30,7 +30,7 @@
 
 ### Step 1: Install required packages
 
-First, install the prerequisites: `zip`, `g++`, `zlipb1g-dev`, `unzip`, and `python`.
+First, install the prerequisites: `pkg-config`, `zip`, `g++`, `zlib1g-dev`, `unzip`, and `python`.
 
 ```bash
 sudo apt-get install pkg-config zip g++ zlib1g-dev unzip python