Problem: 'I installed Lubuntu, but only because that was the only Ubuntu flavour that I could put on my USB I had at the time.'
There are workarounds for this problem: If you only have a small USB pendrive or a CD drive (not DVD), most [or all] Ubuntu and Ubuntu community flavour iso files might be too big.
Use an Ubuntu mini.iso if you can boot in BIOS mode (alias CSM alias legacy mode).
Use an Ubuntu Server iso file and and avoid installing server packages. The 64-bit server iso file makes a boot drive that can boot both in UEFI and BIOS mode.
- If there are still problems (for example with the graphics of the installer in UEFI mode), you can try a compressed image file according to this link.
In both cases the iso files are smaller than the iso files with graphical desktop environments (standard Ubuntu desktop and the community flavours Kubuntu, Lubuntu, ... Xubuntu).
- The
mini.iso file sizes are very small, typically around 60 MB,
- the Ubuntu Server iso files sizes are less than 1 GB (as are most of the Lubuntu iso file sizes),
- the sizes of the other iso files with graphical desktop environments are between 1 GB and 2 GB (typically smaller than or around 1.5 GB).
You can select xubuntu-desktop during the installation, or install it afterwards, when you have booted into the text mode interface, and then you will get Xubuntu.