diff --git a/pleskdistup/common/src/dpkg.py b/pleskdistup/common/src/dpkg.py
index cb74c61..71c5cdc 100644
--- a/pleskdistup/common/src/dpkg.py
+++ b/pleskdistup/common/src/dpkg.py
@@ -126,7 +126,7 @@ def safely_install_packages(
     install_packages(pkgs, repository, force_package_config)
 
 
-def apt_get_retry_temp_fails(
+def exec_retry_when_locked(
     apt_get_cmd: typing.List[str],
     tmpfail_retry_intervals: typing.Optional[typing.List[int]] = None,
     collect_stdout: bool = False,
@@ -160,6 +160,7 @@ def process_stderr(line: str) -> None:
                 "PATH": os.environ["PATH"],
                 "DEBIAN_FRONTEND": "noninteractive",
                 "LC_ALL": "C",
+                "LANG": "C",
             },
         )
         if exit_code == 0:
@@ -186,7 +187,7 @@ def remove_packages(
     if simulate:
         cmd.append("--simulate")
     cmd += pkgs
-    cmd_out = apt_get_retry_temp_fails(cmd, tmpfail_retry_intervals, collect_stdout=True)
+    cmd_out = exec_retry_when_locked(cmd, tmpfail_retry_intervals, collect_stdout=True)
     if simulate:
         return _parse_apt_get_simulation(cmd_out)
     return None
@@ -212,7 +213,7 @@ def find_related_repofiles(repository_file: str) -> typing.List[str]:
 
 def update_package_list(tmpfail_retry_intervals: typing.Optional[typing.List[int]] = None) -> None:
     cmd = ["/usr/bin/apt-get", "update", "-y"]
-    apt_get_retry_temp_fails(cmd, tmpfail_retry_intervals)
+    exec_retry_when_locked(cmd, tmpfail_retry_intervals)
 
 
 def upgrade_packages(
@@ -223,12 +224,12 @@ def upgrade_packages(
         pkgs = []
 
     cmd = ["/usr/bin/apt-get", "upgrade", "-y"] + APT_CHOOSE_OLD_FILES_OPTIONS + pkgs
-    apt_get_retry_temp_fails(cmd, tmpfail_retry_intervals)
+    exec_retry_when_locked(cmd, tmpfail_retry_intervals)
 
 
 def autoremove_outdated_packages(tmpfail_retry_intervals: typing.Optional[typing.List[int]] = None) -> None:
     cmd = ["/usr/bin/apt-get", "autoremove", "-y"]
-    apt_get_retry_temp_fails(cmd, tmpfail_retry_intervals)
+    exec_retry_when_locked(cmd, tmpfail_retry_intervals)
 
 
 def depconfig_parameter_set(parameter: str, value: str) -> None:
@@ -244,12 +245,12 @@ def depconfig_parameter_get(parameter: str) -> str:
 
 def restore_installation(tmpfail_retry_intervals: typing.Optional[typing.List[int]] = None) -> None:
     cmd = ["/usr/bin/apt-get", "-f", "install", "-y"]
-    apt_get_retry_temp_fails(cmd, tmpfail_retry_intervals)
+    exec_retry_when_locked(cmd, tmpfail_retry_intervals)
 
 
 def do_distupgrade(tmpfail_retry_intervals: typing.Optional[typing.List[int]] = None) -> None:
     cmd = ["apt-get", "dist-upgrade", "-y"] + APT_CHOOSE_OLD_FILES_OPTIONS
-    apt_get_retry_temp_fails(cmd, tmpfail_retry_intervals)
+    exec_retry_when_locked(cmd, tmpfail_retry_intervals)
 
 
 def get_installed_packages_list(regex: str) -> typing.List[typing.Tuple[str, str]]:
diff --git a/pleskdistup/common/src/util.py b/pleskdistup/common/src/util.py
index c0c7c0c..c073e49 100644
--- a/pleskdistup/common/src/util.py
+++ b/pleskdistup/common/src/util.py
@@ -52,19 +52,19 @@ def exec_get_output_streamed(
         process.communicate()
         return process.returncode
 
-    while None is process.poll():
+    while process.poll() is None:
         if process_stdout_line is not None:
             if not process.stdout:
                 raise RuntimeError(f"Cannot get process stdout of command {cmd!r}")
             line = process.stdout.readline()
             if line:
-                process_stdout_line(line.rstrip())
+                process_stdout_line(line.rstrip('\n'))
         if process_stderr_line is not None:
             if not process.stderr:
                 raise RuntimeError(f"Cannot get process stderr of command {cmd!r}")
             line = process.stderr.readline()
             if line:
-                process_stderr_line(line.rstrip())
+                process_stderr_line(line.rstrip('\n'))
     return process.returncode