diff --git a/.github/workflows/install.yml b/.github/workflows/install.yml
index ec7a0cf34..52cb45f95 100644
--- a/.github/workflows/install.yml
+++ b/.github/workflows/install.yml
@@ -22,7 +22,7 @@ jobs:
               ./.github/cli-space-cleanup.sh
               df -h
       - name: install
-        run: sudo ./bin/wally-tool-chain-install.sh
+        run: sudo ./bin/wally-tool-chain-install.sh --clean
       - name: make tests
         run: |
               source setup.sh
@@ -56,7 +56,7 @@ jobs:
               nsenter -t 1 -m -u -n -i bash -c "$(cat .github/cli-space-cleanup.sh)"
               df -h
       - name: install
-        run: ./bin/wally-tool-chain-install.sh
+        run: ./bin/wally-tool-chain-install.sh --clean
       - name: make tests
         run: |
               source setup.sh
diff --git a/bin/wally-tool-chain-install.sh b/bin/wally-tool-chain-install.sh
index fdb9d6e4f..1905d484c 100755
--- a/bin/wally-tool-chain-install.sh
+++ b/bin/wally-tool-chain-install.sh
@@ -72,7 +72,7 @@ logger() {
     cat < /dev/stdin | tee -a "$log" | (grep -iE --color=never "(\bwarning|\berror|\bfail|\bsuccess|\bstamp|\bdoesn't work)" || true) | (grep -viE --color=never "(_warning|warning_|_error|error_|-warning|warning-|-error|error-|Werror|error\.o|warning flags)" || true)
 }
 
-set -e # break on error
+set -ex # break on error
 trap error ERR # run error handler on error
 STATUS="setup" # keep track of what part of the installation is running for error messages