diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9abcb32..00edab6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,7 +9,7 @@ jobs:
 
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     permissions:
       contents: write
     steps:
diff --git a/.github/workflows/tunasync.yml b/.github/workflows/tunasync.yml
index cfc15a6..13a73fa 100644
--- a/.github/workflows/tunasync.yml
+++ b/.github/workflows/tunasync.yml
@@ -6,7 +6,7 @@ jobs:
 
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
 
     - name: Check out code into the Go module directory
@@ -36,7 +36,7 @@ jobs:
 
   test:
     name: Test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     services:
       registry:
         image: registry:2
@@ -59,17 +59,10 @@ jobs:
         go-version: '^1.22'
       id: go
 
-    - name: Run Unit tests.
-      run: |
-        go install github.com/wadey/gocovmerge@latest
-        sudo systemd-run --service-type=oneshot --uid="$(id --user)" --pipe --wait \
-          --property=Delegate=yes --setenv=USECURCGROUP=1 \
-          --setenv=TERM=xterm-256color --same-dir \
-          make test
-
     - name: Run Additional Unit tests.
       run: |
         make build-test-worker
+        readelf --dyn-syms -W worker.test
         sudo mkdir /sys/fs/cgroup/tunasync
         sudo ./worker.test -test.v=true -test.coverprofile profile2.cov -test.run TestCgroup
         sudo rmdir /sys/fs/cgroup/tunasync
@@ -190,10 +183,14 @@ jobs:
       run: |
         CUSER="$(id --user --name)"
         sudo rsh 254.255.255.2 bash --noprofile --norc -eo pipefail << EOF
+          exec 2>&1
           cd "/home/${CUSER}"
           lssubsys -am
           cgcreate -a "$CUSER" -t "$CUSER" -g cpu:tunasync
           cgcreate -a "$CUSER" -t "$CUSER" -g memory:tunasync
+          ls -la /sys/fs/cgroup/cpuacct
+          ls -la /sys/fs/cgroup/cpu,acct
+          ls -la /sys/fs/cgroup/memory
           TERM=xterm-256color ./worker.test -test.v=true -test.coverprofile \
             profile3.cov -test.run TestCgroup
           cgexec -g "*:/" bash -c "echo 0 > /sys/fs/cgroup/systemd/tasks; exec sudo -u $CUSER env USECURCGROUP=1 TERM=xterm-256color cgexec -g cpu,memory:tunasync ./worker.test -test.v=true -test.coverprofile profile4.cov -test.run TestCgroup"
diff --git a/.umlrootfs/Dockerfile b/.umlrootfs/Dockerfile
index 8026f67..0a4fa73 100644
--- a/.umlrootfs/Dockerfile
+++ b/.umlrootfs/Dockerfile
@@ -1,5 +1,8 @@
 FROM debian:bullseye
 RUN apt-get update && apt-get install -y systemd rsh-redone-server ifupdown sudo kmod cgroup-tools systemd-sysv
+RUN echo "deb http://deb.debian.org/debian bookworm main" > /etc/apt/sources.list.d/bookworm.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends -t bookworm libc6
 RUN echo "host" > /root/.rhosts && \
     chmod 600 /root/.rhosts && \
     /bin/echo -e "auto eth0\niface eth0 inet static\naddress 254.255.255.2/24" > /etc/network/interfaces.d/eth0 && \