PPA breaks Updates

[ockies]

Hi all,
I tried to update and got a similar message:
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Ign:3 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial InRelease
Hit:4 http://repo.linuxliteos.com/linuxlite citrine InRelease
Hit:5 http://archive.canonical.com/ubuntu xenial InRelease
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Hit:7 http://ppa.launchpad.net/nemh/systemback/ubuntu xenial InRelease
Hit:8 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu xenial InRelease
Hit:9 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu xenial InRelease
Get:10 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Get:11 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages [247 kB]
Hit:12 http://ppa.launchpad.net/unit193/crosswire/ubuntu xenial InRelease
Get:13 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [516 kB]
Ign:14 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial Release
Ign:15 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main i386 Packages
Get:16 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en [109 kB]
Get:17 http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages [99.4 kB]
Get:18 http://security.ubuntu.com/ubuntu xenial-security/universe Translation-en [58.0 kB]
Ign:19 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main all Packages
Get:20 http://us.archive.ubuntu.com/ubuntu xenial-updates/main Translation-en [215 kB]
Get:21 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [450 kB]
Ign:22 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en_US
Get:23 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe Translation-en [182 kB]
Ign:24 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main i386 Packages
Ign:19 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en_US
Ign:24 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main i386 Packages
Ign:19 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en_US
Ign:24 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main i386 Packages
Ign:19 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en_US
Ign:24 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main i386 Packages
Ign:19 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en_US
Ign:24 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en
Err:15 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main i386 Packages
  404  Not Found
Ign:19 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main all Packages
Ign:22 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en_US
Ign:24 http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial/main Translation-en
Fetched 2,183 kB in 10s (215 kB/s)
Reading package lists...
W: The repository 'http://ppa.launchpad.net/ffmulticonverter/stable/ubuntu xenial Release' does not have a Release file.
E: Failed to fetch http://ppa.launchpad.net/ffmulticonverte...6/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

I followed Ralphy's advice, typed in df -h in console and got the following result:
os@os-Satellite-C55-A:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            1.9G    0  1.9G  0% /dev
tmpfs          393M  6.4M  387M  2% /run
/dev/sda1      455G  218G  215G  51% /
tmpfs          2.0G  112K  2.0G  1% /dev/shm
tmpfs          5.0M  4.0K  5.0M  1% /run/lock
tmpfs          2.0G    0  2.0G  0% /sys/fs/cgroup
cgmfs          100K    0  100K  0% /run/cgmanager/fs
tmpfs          393M  44K  393M  1% /run/user/1000


Any assistance would be highly appreciated.