Just installed K3B, and I cannot get it to work at all

I recently upgraded from an obsolete machine and a no-longer-supported version of Ubuntu to a newer, faster machine with Ubuntu 18.04.4 LTS (Bionic Beaver, 64-bit). I am running MATE as my user interface (version 1.20.1).

On my old machine, burning audio CDs with K3B was virtually effortless. Whenever I hit "burn", the process usually went smoothly and successfully.

On my new machine with the new OS, I get the following error message:

"cdrecord has no permission to open the device Modify the device settings in K3B to solve this problem. "

Here is the debugging information:

Devices

hp DVD A DH16ABLH 3HD9 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R Sequential, DVD-R Dual Layer Sequential, DVD-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

System

K3b Version: 17.12.3 KDE Version: 5.44.0 Qt Version: 5.9.5 Kernel: 5.3.0-46-generic

Used versions

cdrecord: 1.1.11

cdrecord

/usr/bin/wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits. /usr/bin/wodim: Resource temporarily unavailable. Cannot get mmap for 12587008 Bytes on /dev/zero. Text len: 54 TOC Type: 0 = CD-DA

cdrecord command:

/usr/bin/wodim -v gracetime=2 dev=/dev/sr0 speed=40 -sao driveropts=burnfree textfile=/tmp/k3b.oo7726 -useinfo -audio /tmp/k3b_audio_0_01.inf /tmp/k3b_audio_0_02.inf /tmp/k3b_audio_0_03.inf /tmp/k3b_audio_0_04.inf /tmp/k3b_audio_0_05.inf /tmp/k3b_audio_0_06.inf /tmp/k3b_audio_0_07.inf /tmp/k3b_audio_0_08.inf /tmp/k3b_audio_0_09.inf /tmp/k3b_audio_0_10.inf /tmp/k3b_audio_0_11.inf

I checked the permission settings in K3B, and everything looks the way it supposedly should. Still, I get the error message every time I try to burn a CD.

Furthermore, K3B (version 17.12.3) saves K3B project files in the form of ZIP files instead of the K3B files that the old version used. Consequently, when I try to open a K3B project file, it doesn't show up in the program's "open" command.

What we have here is either a very buggy program or something which can hopefully be easily and quickly solved.

Can anyone help me with this?