diff --git a/Earthfile b/Earthfile
index ee078bf8..4cb5cd72 100644
--- a/Earthfile
+++ b/Earthfile
@@ -13,7 +13,7 @@ VERSION 0.7
 
 # Start with older Ubuntu to ensure GLIBC symbol versioning support for older linux
 # Ensure we are using an amd64 platform because some of these targets use cross-platform tooling
-FROM ubuntu:24.04
+FROM ubuntu:18.04
 
 ENV ZIG_VERSION=0.13.0-dev.46+3648d7df1
 ENV RUSTUP_HOME=/usr/local/rustup
@@ -28,7 +28,7 @@ WORKDIR /veilid
 # Install build prerequisites & setup required directories
 deps-base:
     RUN apt-get -y update
-    RUN apt-get install -y iproute2 curl build-essential cmake libssl-dev openssl file git pkg-config libdbus-1-dev libdbus-glib-1-dev libgirepository1.0-dev libcairo2-dev checkinstall unzip libncursesw5-dev libncurses5-dev capnproto
+    RUN apt-get install -y iproute2 curl build-essential cmake libssl-dev openssl file git pkg-config libdbus-1-dev libdbus-glib-1-dev libgirepository1.0-dev libcairo2-dev checkinstall unzip libncursesw5-dev libncurses5-dev
 
 # Install Rust
 deps-rust:
diff --git a/veilid-core/build.rs b/veilid-core/build.rs
index f14bc1cd..0c804316 100644
--- a/veilid-core/build.rs
+++ b/veilid-core/build.rs
@@ -42,9 +42,9 @@ where
         return Ok(true);
     };
 
-    // Check if capnp version hash has changed
+    // Check if desired CAPNP_VERSION hash has changed
     let mut hasher = Sha256::new();
-    hasher.update(get_capnp_version_string().as_bytes());
+    hasher.update(get_desired_capnp_version_string().as_bytes());
     let capnp_hash = hex::encode(hasher.finalize()).as_bytes().to_vec();
 
     let in_bh = make_build_hash(input);
@@ -55,7 +55,7 @@ where
     }
 
     if out_capnp_hash != capnp_hash {
-        println!("cargo:warning=Capnp version hash has changed.");
+        println!("cargo:warning=Capnp desired version hash has changed.");
         return Ok(true);
     }
 
@@ -84,7 +84,7 @@ fn get_build_hash_and_capnp_version_hash<Q: AsRef<Path>>(
         let l = l.unwrap();
         if let Some(rest) = l.strip_prefix("//BUILDHASH:") {
             build_hash = Some(hex::decode(rest).unwrap());
-        } else if let Some(rest) = l.strip_prefix("//CAPNPVERSIONHASH:") {
+        } else if let Some(rest) = l.strip_prefix("//CAPNPDESIREDVERSIONHASH:") {
             capnp_version_hash = Some(hex::decode(rest).unwrap());
         }
     }
@@ -113,7 +113,7 @@ fn append_hash_and_detected_capnp_version_hash<P: AsRef<Path>, Q: AsRef<Path>>(
     hasher.update(get_capnp_version_string().as_bytes());
     writeln!(
         out_file,
-        "\n//CAPNPVERSIONHASH:{}",
+        "\n//CAPNPDESIREDVERSIONHASH:{}",
         hex::encode(hasher.finalize())
     )
     .unwrap();
diff --git a/veilid-core/proto/veilid_capnp.rs b/veilid-core/proto/veilid_capnp.rs
index 07d4f639..60f7fbf6 100644
--- a/veilid-core/proto/veilid_capnp.rs
+++ b/veilid-core/proto/veilid_capnp.rs
@@ -22244,4 +22244,4 @@ pub mod operation {
 
 //BUILDHASH:a28970f74fcf7989d47e1457e848e5de33d8b7a4003a0e439c95f442ecf69fd3
 
-//CAPNPVERSIONHASH:bfec2e34583ada7e6af2cb73993fb75a3f7147a6c943e5ff5f5c4294fc577b90
+//CAPNPDESIREDVERSIONHASH:bfec2e34583ada7e6af2cb73993fb75a3f7147a6c943e5ff5f5c4294fc577b90