Public bug reported:

Hello,

After installing fresh new 20.04 LTS release, and installing iotop 
0.6-24-g733f3f8-1
, it returns below error.  Appreciate any pointers as how to correct this?  

Thank you.

Traceback (most recent call last):
  File "/usr/sbin/iotop", line 10, in <module>
    from iotop.ui import main
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 46, in <module>
    from iotop.data import find_uids, TaskStatsNetlink, ProcessList, Stats
  File "/usr/lib/python3/dist-packages/iotop/data.py", line 51, in <module>
    vmstat_f = VmStat()
  File "/usr/lib/python3/dist-packages/iotop/vmstat.py", line 23, in __init__
    self.vmstat = self.read()
  File "/usr/lib/python3/dist-packages/iotop/vmstat.py", line 40, in read
    return pgpgin, pgpgout
UnboundLocalError: local variable 'pgpgin' referenced before assignment

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: iotop 0.6-24-g733f3f8-1
ProcVersionSignature: Ubuntu 5.4.0-1032.33-kvm 5.4.78
Uname: Linux 5.4.0-1032-kvm x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon Feb 15 00:07:23 2021
Dependencies:
 
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: iotop
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: iotop (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal uec-images

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https://bugs.launchpad.net/bugs/1915670

Title:
  iotop 0.6-24-g733f3f8-1 fails with 'UnboundLocalError' on newly
  installed 20.04 release

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