Exception: test has an exceptional event (KRNL-5788:01) with text NoText

[fizista]

Describe the bug
An exception is reported: Exception occurred, no output from apt-cache policy

Version

• Distribution Ubuntu 20.04
• Lynis version 3.0.6

Expected behavior

Output

2021-10-13 16:24:05 Performing test ID KRNL-5788 (Checking availability new Linux kernel)
2021-10-13 16:24:05 Test: Searching apt-cache, to determine if a newer kernel is available
2021-10-13 16:24:05 Result: found /usr/bin/apt-cache
2021-10-13 16:24:05 Test: checking presence of /vmlinuz or /boot/vmlinuz
2021-10-13 16:24:05 Result: found /boot/vmlinuz
2021-10-13 16:24:05 Test: checking readlink location of /boot/vmlinuz
2021-10-13 16:24:05 Output: readlink reported file /boot/vmlinuz-5.4.0-88-generic
2021-10-13 16:24:05 Test: checking package from dpkg -S
2021-10-13 16:24:05 Output: dpkg -S reported package linux-image-5.4.0-88-generic
2021-10-13 16:24:05 Test: Using apt-cache policy to determine if there is an update available
2021-10-13 16:24:05 Kernel installed:
2021-10-13 16:24:05 Kernel candidate:
2021-10-13 16:24:05 Result: Exception occurred, no output from apt-cache policy
2021-10-13 16:24:05 Exception: test has an exceptional event (KRNL-5788:01) with text NoText
2021-10-13 16:24:10 Suggestion: Check the output of apt-cache policy to determine why its output is empty [test:KRNL-5788] [details:-] [solution:-]
2021-10-13 16:24:10 Result: apt-cache policy did not return an installed kernel version

# dpkg -l | grep linux-image-5.4.0-88-generic
ii  linux-image-5.4.0-88-generic   5.4.0-88.99                           amd64        Signed kernel image generic

# apt-cache policy linux-image-5.4.0-88-genericlinux-image-5.4.0-88-generic:
  Zainstalowana: 5.4.0-88.99
  Kandydująca:   5.4.0-88.99
  Tabela wersji:
 *** 5.4.0-88.99 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status

# LC_ALL=C apt-cache policy linux-image-5.4.0-88-generic
linux-image-5.4.0-88-generic:
  Installed: 5.4.0-88.99
  Candidate: 5.4.0-88.99
  Version table:
 *** 5.4.0-88.99 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status

Additional context
Depends on system language settings.

The temporary solution is:
LC_ALL=C lynis audit system