diff --git a/scripts/gen.py b/scripts/gen.py
index 29f6454..399b6ab 100644
--- a/scripts/gen.py
+++ b/scripts/gen.py
@@ -101,8 +101,15 @@ def copy_mbusb_dir_usb(usb_disk):
     :param usb_mount_path: Path to USB mount.
     :return:
     """
+#     from .iso import iso_size
+    from .usb import details, PartitionNotMounted
+
+    try:
+        usb_details = details(usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return False
 
-    usb_details = config.usb_details
     usb_mount_path = usb_details['mount_point']
     result = ''
     if not os.path.exists(os.path.join(usb_mount_path, "multibootusb")):
@@ -150,7 +157,7 @@ def copy_mbusb_dir_usb(usb_disk):
     if not os.path.exists(os.path.join(usb_mount_path, 'multibootusb', 'grub', 'core-msdos.img')):
         shutil.copy(resource_path(os.path.join('data', 'multibootusb', 'grub', 'core-msdos.img')),
                     os.path.join(usb_mount_path, 'multibootusb', 'grub', 'core-msdos.img'))
-    
+
     if not os.path.exists(os.path.join(usb_mount_path, 'multibootusb', 'grub', 'x86_64-efi')):
         log("New EFI modules does not exist. Copying now.")
         shutil.copytree(resource_path(os.path.join('data', 'multibootusb', 'grub', 'x86_64-efi')),
@@ -208,8 +215,13 @@ def strings(filename, _min=4):
 
 def size_not_enough(iso_link, usb_disk):
     from .iso import iso_size
+    from .usb import details, PartitionNotMounted
     isoSize = iso_size(iso_link)
-    usb_details = config.usb_details
+    try:
+        usb_details = details(usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return False
     usb_size = usb_details['size_free']
 
     return bool(isoSize > usb_size)
@@ -351,7 +363,7 @@ class MemoryCheck():
     Cross platform way to checks memory of a given system. Works on Linux and Windows.
     psutil is a good option to get memory info. But version 5.0 and only will work.
     Source: https://doeidoei.wordpress.com/2009/03/22/python-tip-3-checking-available-ram-with-python/
-    Call this class like this: 
+    Call this class like this:
     mem_info = memoryCheck()
     print(mem_info.value)
     """
@@ -396,8 +408,8 @@ class MemoryCheck():
         """
         totalMemory = os.popen("free -m").readlines()[1].split()[1]
         return int(totalMemory)
-    
 
+    
 if __name__ == '__main__':
     log(quote("""Test-string"""))
     log(has_digit("test-string-with-01-digit"))
diff --git a/scripts/install.py b/scripts/install.py
index 5de34a4..948d73b 100644
--- a/scripts/install.py
+++ b/scripts/install.py
@@ -159,8 +159,12 @@ def install_progress():
     :return:
     """
     from . import progressbar
+    try:
+        usb_details = details(config.usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return
 
-    usb_details = config.usb_details
     config.usb_mount = usb_details['mount_point']
     usb_size_used = usb_details['size_used']
     thrd = threading.Thread(target=install_distro, name="install_progress")
diff --git a/scripts/mbusb_cli.py b/scripts/mbusb_cli.py
index 7ec2266..4748456 100644
--- a/scripts/mbusb_cli.py
+++ b/scripts/mbusb_cli.py
@@ -55,7 +55,11 @@ def cli_install_distro():
     #    log(config.image_path + ' failed to pass integrity check...')
     #    exit(1)
     else:
-        usb_details = details(config.usb_disk)
+        try:
+            usb_details = details(config.usb_disk)
+        except PartitionNotMounted as e:
+            log(str(e))
+            exit(1)
         config.usb_mount = usb_details['mount_point']
         config.usb_uuid = usb_details['uuid']
         config.usb_label = usb_details['label']
diff --git a/scripts/mbusb_gui.py b/scripts/mbusb_gui.py
index af10cd9..ad629f4 100644
--- a/scripts/mbusb_gui.py
+++ b/scripts/mbusb_gui.py
@@ -160,7 +160,7 @@ class AppGui(qemu.Qemu, Imager, QtWidgets.QMainWindow, Ui_MainWindow):
 		"""
 		self.ui.installed_distros.clear()
 		config.usb_disk = osdriver.listbox_entry_to_device(
-                        self.ui.combo_drives.currentText())
+			self.ui.combo_drives.currentText())
 		if config.usb_disk == 0 or config.usb_disk:
 			# Get the GPT status of the disk and store it on a variable
 			try:
diff --git a/scripts/syslinux.py b/scripts/syslinux.py
index 78d92c7..f65ca75 100644
--- a/scripts/syslinux.py
+++ b/scripts/syslinux.py
@@ -135,7 +135,12 @@ def syslinux_default(usb_disk):
     :version: Default version is 4. Change it if you wish. But necessary files needs to be copied accordingly
     :return: Bootable USB disk :-)
     """
-    usb_details = usb.details(usb_disk)
+    try:
+        usb_details = usb.details(config.usb_disk)
+    except usb.PartitionNotMounted as e:
+        log(str(e))
+        return False
+
     usb_fs = usb_details['file_system']
     usb_mount = usb_details['mount_point']
     mbr_bin = get_mbr_bin_path(usb_disk)
@@ -276,7 +281,12 @@ def syslinux_distro_dir(usb_disk, iso_link, distro):
     :param iso_link: Path to ISO file
     :return:
     """
-    usb_details = usb.details(usb_disk)
+    try:
+        usb_details = usb.details(config.usb_disk)
+    except usb.PartitionNotMounted as e:
+        log(str(e))
+        return
+
     usb_fs = usb_details['file_system']
     usb_mount = usb_details['mount_point']
     isolinux_bin_dir(iso_link)
diff --git a/scripts/uninstall_distro.py b/scripts/uninstall_distro.py
index c543790..5f4f99f 100644
--- a/scripts/uninstall_distro.py
+++ b/scripts/uninstall_distro.py
@@ -21,7 +21,12 @@ def install_distro_list():
     List all distro names installed by previous install
     :return:  List of distro names as list
     """
-    usb_details = config.usb_details
+    try:
+        usb_details = details(config.usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return
+
     config.usb_mount = usb_details['mount_point']
     sys_cfg_file = os.path.join(config.usb_mount, "multibootusb", "syslinux.cfg")
 
@@ -54,7 +59,12 @@ def delete_frm_file_list(iso_file_list, uninstall_distro_dir_name):
     :param config.uninstall_distro_dir_name: Directory where the distro is installed
     :return:
     """
-    usb_details = config.usb_details
+    try:
+        usb_details = details(config.usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return
+
     usb_mount = usb_details['mount_point']
     if iso_file_list is not None:
         for f in iso_file_list:
@@ -100,7 +110,11 @@ def do_uninstall_distro(target_distro, uninstall_distro_dir_name):
     :param uninstall_distro_dir_name: Directory where the distro is installed
     :return:
     """
-    usb_details = config.usb_details
+    try:
+        usb_details = details(config.usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return
     usb_mount = usb_details['mount_point']
 
     if platform.system() == 'Linux':
@@ -218,7 +232,12 @@ def uninstall_progress():
     :return:
     """
     from . import progressbar
-    usb_details = config.usb_details
+    try:
+        usb_details = details(config.usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return
+
     usb_mount = usb_details['mount_point']
 
     uninstall_distro_dir_name = config.uninstall_distro_dir_name \
diff --git a/scripts/update_cfg_file.py b/scripts/update_cfg_file.py
index f509146..8aae75f 100644
--- a/scripts/update_cfg_file.py
+++ b/scripts/update_cfg_file.py
@@ -126,7 +126,12 @@ def update_distro_cfg_files(iso_link, usb_disk, distro, persistence=0):
     Main function to modify/update distro specific strings on distro config files.
     :return:
     """
-    usb_details = config.usb_details
+    try:
+        usb_details = details(config.usb_disk)
+    except PartitionNotMounted as e:
+        log(str(e))
+        return
+
     usb_mount = usb_details['mount_point']
     usb_uuid = usb_details['uuid']
     usb_label = usb_details['label']
diff --git a/scripts/usb.py b/scripts/usb.py
index 904ef10..6121f0e 100644
--- a/scripts/usb.py
+++ b/scripts/usb.py
@@ -30,6 +30,12 @@ if platform.system() == 'Windows':
     import win32com.client
 
 
+class PartitionNotMounted(Exception):
+
+    def __init__(self, partition):
+        self.message = 'Partition is not mounted: {}'.format(partition)
+
+
 def is_block(usb_disk):
     """
     Function to detect if the USB is block device
@@ -281,7 +287,7 @@ def details_udev(usb_disk_part):
         fdisk_cmd = 'LANG=C fdisk -l ' + usb_disk_part + \
           ' | grep "^Disk /" | sed -re "s/.*\s([0-9]+)\sbytes.*/\\1/"'
         size_total = subprocess.check_output(fdisk_cmd, shell=True).strip()
-        size_used = ""
+        size_used = 0
         size_free = 0
         mount_point = ""
 
@@ -344,9 +350,7 @@ def details_udisks2(usb_disk_part):
             size_total, size_used, size_free = \
                         shutil.disk_usage(mount_point)[:3]
     else:
-        size_total = str('No_Mount')
-        size_used = str('No_Mount')
-        size_free = 0
+        raise PartitionNotMounted(usb_disk_part)
 
     return {'uuid': uuid, 'file_system': file_system, 'label': label, 'mount_point': mount_point,
             'size_total': size_total, 'size_used': size_used, 'size_free': size_free,