Formatting USB memory in Ubuntu 18.04

In a terminal type 'sudo lsblk' then note the NAME of the USB.
Then type 'sudo dd if=/dev/zero of=/dev/sda bs=4M iflag=nocache oflag=direct' to overwrite it with zeroes in blocks of 4M. Check with lsblk above again, and note the NAME of the USB (without numeric ending, eg sdb NOT sdb1).
Once done, type 'sudo parted /dev/sdb mklabel msdos' ie NAME of USB. It may complain and ask to reboot. Oblige. Once up, re-type.

Then call utility 'Disk' using [Window] key. It will bring up all the volumes (hard disk, USB) on the left pane. Select the right volume (USB). Then on the right pane tap [+] (near the two gears icon) to create partition with a chosen format (FAT32, preferably). Initially its Partition type is Linux.
It has a sliding option of 'Erase data or not' [while partitioning]. I choose 'Erase' which takes time [20' for 32 GB]. Eventually, its Partition type is FAT32.

To mount it for the first time, tap the triangle icon at the bottom of the volume on the right pane.