CPU 100% Usage with aptd (python3)? How do I resolve this process issue?

Question

I've been having this happen for a while - not too sure what caused it.

There's one or two processes (here /usr/sbin/aptd) that always spike up to 98-100% CPU usage, and I'm not sure how to solve this.

Would someone mind clarifying what the issue is, and if uninstalling Python 2.7 (and dependencies, i.e. Python 3, etc.) would help?

Thanks.

Edit: sudo apt-get update gives me the following errors:

david@david-Blade:~$ sudo apt-get upgrade
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
david@david-Blade:~$  sudo apt-get -y update
E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

Update 1:

Tried running sudo killall -9 apt-get and sudo kill -9 _pid_ as per instructions here and it appears that I'm unable to do so? Consequently, dpkg is blocked by another process and I can't run sudo dpkg-reconfigure -phigh -a or sudo dpkg --configure -a.

david@david-Blade:~$ sudo killall -9 apt-get
apt-get: no process found
david@david-Blade:~$ sudo kill -9 _pid_ 
kill: failed to parse argument: '_pid_'

Update 2:

Ran 'sudo dkpg --configure -a' and disabled my UEFI booter. Running sudo apt-get update gives me the following error log:

david@david-Blade:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  bsdtar libgsoap8 libmuparser2v5 libqt4-opengl libvncserver1 linux-image-extra-4.4.0-31-generic
  linux-image-extra-4.4.0-42-generic linux-signed-image-4.4.0-42-generic linux-tools-4.4.0-42
  linux-tools-4.4.0-42-generic python3-blinker python3-cffi-backend python3-cryptography python3-dateutil
  python3-idna python3-jwt python3-oauthlib python3-requests-oauthlib python3-tz ruby-childprocess ruby-domain-name
  ruby-erubis ruby-ffi ruby-http-cookie ruby-i18n ruby-listen ruby-log4r ruby-mime-types ruby-net-scp ruby-net-sftp
  ruby-net-ssh ruby-netrc ruby-nokogiri ruby-rb-inotify ruby-rest-client ruby-sqlite3 ruby-unf ruby-unf-ext sqlite3
  thunderbird-locale-en thunderbird-locale-en-gb thunderbird-locale-en-us virtualbox-dkms
Use 'sudo apt autoremove' to remove them.
The following packages will be upgraded:
  apparmor base-files distro-info-data dkms gnome-software gnome-software-common google-chrome-stable im-config
  initramfs-tools initramfs-tools-bin initramfs-tools-core language-pack-en language-pack-gnome-en libapparmor-perl
  libapparmor1 libc-bin libc-dev-bin libc6 libc6:i386 libc6-dbg libc6-dev libc6-i386 libqt5core5a libqt5dbus5
  libqt5gui5 libqt5network5 libqt5opengl5 libqt5printsupport5 libqt5sql5 libqt5sql5-sqlite libqt5widgets5 libqt5xml5
  libwhoopsie0 locales macbuntu-os-icons-lts-v7 macbuntu-os-ithemes-lts-v7 multiarch-support python3-distupgrade
  python3-update-manager r-base r-base-core r-base-dev r-base-html r-cran-cluster r-cran-codetools r-doc-html
  r-recommended snapd ubuntu-release-upgrader-core ubuntu-release-upgrader-gtk unattended-upgrades update-manager
  update-manager-core update-notifier update-notifier-common virtualbox-5.1 whoopsie
57 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 192 MB of archives.
After this operation, 865 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
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Get:21 http://cran.rstudio.com/bin/linux/ubuntu xenial/ r-cran-cluster 2.0.5-1xenial0 [490 kB]                       
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Err:50 http://ca.archive.ubuntu.com/ubuntu xenial-updates/main amd64 gnome-software amd64 3.20.1+git20160923.2.7374bdc-0ubuntu1~xenial1
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E: Failed to fetch http://ca.archive.ubuntu.com/ubuntu/pool/main/g/glibc/libc6_2.23-0ubuntu4_amd64.deb 404  Not Found [IP: 2001:67c:1360:8001::21 80]

E: Failed to fetch http://ca.archive.ubuntu.com/ubuntu/pool/main/g/glibc/libc6_2.23-0ubuntu4_i386.deb 404  Not Found [IP: 2001:67c:1360:8001::21 80]

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E: Unable to fetch some archives, try running apt-get update or apt-get --fix-missing.