Short story: Installed xUbuntu beside Win XP on an new partition - cant get a boot to linux in the BIOS or
Background:
I have an old HP Lenovo S10 Ideapad that I want to make into a Linux 'netbook'.
I downloaded Xubuntu 18.04.5 LTS, set up a boot USB, changed the Boot order to boot from USB, booted it up in Xubuntu, tried it out. Looked ok, albeit a little slow, which I figured was mostly the read time from the USB, and decided to give the install to HDD a go. The wifi wasn't working either, but one thing at a time. I chose to install beside the existing XP installation (which was and is still working).
First time around it just seemed to hang so after leaving it for 24 hrs I shut it down and tried again. I discovered the HDD had been partitioned with some free space, but nothing beyond that. Trying again, but this time with a lan connection to the router I directed the install into the free space, and it all seemed to go well, progressing through to the point where the installer asks to re-start to boot from the HDD. Which I chose to do - (removing the USB stick to allow the boot order to bypass the USB).
This is where I found the PC still wants to Boot to the XP installation (actually it pauses to ask which XP I want, there being two, but I'll solve that problem later), and gives no option to boot to Linux. I re-booted to the USB and looked at the new partition, and the Linux files seem to be there.
I can't find anything on line specific to an installation beside Windows XP, on an i386, and using using newer versions of Linux. All the posts seem to be at least 5 years old and deal with issues that may have since been de-bugged. Nothing looks exactly like the issue I have.
So my question is- what's the next step? How do I get it to display the Linux partition as a boot option?
Vital Statistics:
PC:
1.6GHz N270 Intel Atom Processor.
1GB PC2-5300 DDR2 SDRAM 667MHz.
Windows XP Home Edition (SP3)
160GB 5400rpm hard drive.
Partitions (as shown in GParted):
/dev/sda1 fat32 87 GB (this is original Windows XP Boot, 32 GB free)
/dev/sda3 extended
/dev/sda6 ext4 /media/xubuntu/[lots after this] 16.6 GB (This is the linux, 10.4GB free)
/dev/sda5 nfts 30.4 GB (this is existing user data 15GB free)
unallocated 1.7 GB
/dev/sda4 nfts 14.75GB (This is the XP recovery partition)
BIOS:
Bios Version 14CN3944
Boot order: 1: USB key, 2 USB FDD, 3 USB HDD, 4 HDD Hitachi HT(xxx)-(S, 5 USB CDROM, 6 LAN
OS Choices:
Windows XP Home Edition
Windows XP Home Edition