What's wrong with my Lubuntu desktop (not loading)?

Question

After recently updating my Lubuntu install (on an old (>10 years) netbook), the desktop no longer loads. After showing the standard terminal checks, the taskbar will usually load, but the rest of the desktop won't. THe taskbar will update as well. For example, if I turn off wifi, the taskbar will show I am no longer connected. If I quit dropbox, the taskbar removes that icon. I can still use the computer in the terminal with ctrl+alt+F1, etc., but the desktop won't load.

Any ideas how I can fix this, what to look for, etc.? I'd like to avoid a reinstall if possible, mostly because I'd prefer to learn something since this isn't my main machine. Also, if the update broke something, a reinstall won't help much.

Usually the taskbar loads correctly (with "start" menu, status icons, etc.). It stopped doing so after a little troubleshooting.

Edit: Lubuntu 16.04, Intel Atom N270.

Most recent update:

Start-Date: 2018-02-21  14:49:08
Commandline: apt-get upgrade
Requested-By: user (1000)
Upgrade: ca-certificates-java:i386 (20160321, 20160321ubuntu1), evince:i386 (3.18.2-1ubuntu4.2, 3.18.2-1ubuntu4.3), libnm-glib4:i386 (1.2.6-0ubuntu0.16.04.1, 1.2.6-0ubuntu0.16.04.2), libmpx0:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), lubuntu-core:i386 (0.65.2, 0.65.3), libdns-export162:i386 (1:9.10.3.dfsg.P4-8ubuntu1.9, 1:9.10.3.dfsg.P4-8ubuntu1.10), python2.7-dev:i386 (2.7.12-1ubuntu0~16.04.1, 2.7.12-1ubuntu0~16.04.3), libgcc-5-dev:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), poppler-utils:i386 (0.41.0-0ubuntu1.5, 0.41.0-0ubuntu1.6), libgles2-mesa:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), libseccomp2:i386 (2.2.3-3ubuntu3, 2.3.1-2.1ubuntu2~16.04.1), libaudit-common:i386 (1:2.4.5-1ubuntu2, 1:2.4.5-1ubuntu2.1), libisccfg140:i386 (1:9.10.3.dfsg.P4-8ubuntu1.9, 1:9.10.3.dfsg.P4-8ubuntu1.10), libcups2:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), intel-microcode:i386 (3.20170707.1~ubuntu16.04.0, 3.20180108.0+really20170707ubuntu16.04.1), update-manager-core:i386 (1:16.04.10, 1:16.04.12), uuid-runtime:i386 (2.27.1-6ubuntu3.3, 2.27.1-6ubuntu3.4), unity-control-center-faces:i386 (15.04.0+16.04.20170214-0ubuntu1, 15.04.0+16.04.20171130-0ubuntu1), libfdisk1:i386 (2.27.1-6ubuntu3.3, 2.27.1-6ubuntu3.4), libdrm-nouveau2:i386 (2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), transmission-common:i386 (2.84-3ubuntu3, 2.84-3ubuntu3.1), linux-libc-dev:i386 (4.4.0-101.124, 4.4.0-116.140), libevdocument3-4:i386 (3.18.2-1ubuntu4.2, 3.18.2-1ubuntu4.3), libcurl3:i386 (7.47.0-1ubuntu2.4, 7.47.0-1ubuntu2.6), libapt-inst2.0:i386 (1.2.24, 1.2.25), openssl:i386 (1.0.2g-1ubuntu4.9, 1.0.2g-1ubuntu4.10), gir1.2-gdkpixbuf-2.0:i386 (2.32.2-1ubuntu1.3, 2.32.2-1ubuntu1.4), libgdk-pixbuf2.0-0:i386 (2.32.2-1ubuntu1.3, 2.32.2-1ubuntu1.4), libc6-dev:i386 (2.23-0ubuntu9, 2.23-0ubuntu10), update-notifier-common:i386 (3.168.5, 3.168.7), libwbclient0:i386 (2:4.3.11+dfsg-0ubuntu0.16.04.11, 2:4.3.11+dfsg-0ubuntu0.16.04.12), libgweather-3-6:i386 (3.18.2-0ubuntu0.1, 3.18.2-0ubuntu0.2), libsystemd0:i386 (229-4ubuntu21, 229-4ubuntu21.1), libpulsedsp:i386 (1:8.0-0ubuntu3.4, 1:8.0-0ubuntu3.7), grub-common:i386 (2.02~beta2-36ubuntu3.14, 2.02~beta2-36ubuntu3.16), apt:i386 (1.2.24, 1.2.25), libparted2:i386 (3.2-15, 3.2-15ubuntu0.1), pulseaudio:i386 (1:8.0-0ubuntu3.4, 1:8.0-0ubuntu3.7), cpp-5:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), libglapi-mesa:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), python2.7-minimal:i386 (2.7.12-1ubuntu0~16.04.1, 2.7.12-1ubuntu0~16.04.3), libmount1:i386 (2.27.1-6ubuntu3.3, 2.27.1-6ubuntu3.4), update-manager:i386 (1:16.04.10, 1:16.04.12), binutils:i386 (2.26.1-1ubuntu1~16.04.5, 2.26.1-1ubuntu1~16.04.6), bind9-host:i386 (1:9.10.3.dfsg.P4-8ubuntu1.9, 1:9.10.3.dfsg.P4-8ubuntu1.10), xserver-xorg-video-amdgpu-hwe-16.04:i386 (1.3.0-0ubuntu1~16.04.1, 1.4.0-1~16.04.1), libitm1:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), libpython-all-dev:i386 (2.7.11-1, 2.7.12-1~16.04), dnsutils:i386 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15.04.0+16.04.20171130-0ubuntu1), libc-dev-bin:i386 (2.23-0ubuntu9, 2.23-0ubuntu10), libxml2:i386 (2.9.3+dfsg1-1ubuntu0.3, 2.9.3+dfsg1-1ubuntu0.5), libcupsppdc1:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), gir1.2-webkit2-4.0:i386 (2.18.3-0ubuntu0.16.04.1, 2.18.6-0ubuntu0.16.04.1), libpython2.7-minimal:i386 (2.7.12-1ubuntu0~16.04.1, 2.7.12-1ubuntu0~16.04.3), multiarch-support:i386 (2.23-0ubuntu9, 2.23-0ubuntu10), libdrm-intel1:i386 (2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), transmission-gtk:i386 (2.84-3ubuntu3, 2.84-3ubuntu3.1), firefox:i386 (57.0+build4-0ubuntu0.16.04.5, 58.0.2+build1-0ubuntu0.16.04.1), rsync:i386 (3.1.1-3ubuntu1, 3.1.1-3ubuntu1.2), apparmor:i386 (2.10.95-0ubuntu2.7, 2.10.95-0ubuntu2.8), libisccc140:i386 (1:9.10.3.dfsg.P4-8ubuntu1.9, 1:9.10.3.dfsg.P4-8ubuntu1.10), apt-transport-https:i386 (1.2.24, 1.2.25), libdrm-radeon1:i386 (2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), xserver-xorg-video-nouveau-hwe-16.04:i386 (1:1.0.14-0ubuntu1~16.04.1, 1:1.0.15-2~16.04.1), xserver-xorg-legacy-hwe-16.04:i386 (2:1.19.3-1ubuntu1~16.04.4, 2:1.19.5-0ubuntu2~16.04.1), libpython3.5-stdlib:i386 (3.5.2-2ubuntu0~16.04.3, 3.5.2-2ubuntu0~16.04.4), cups-core-drivers:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), linux-firmware:i386 (1.157.13, 1.157.16), libunity-scopes-json-def-desktop:i386 (7.1.4+16.04.20160701-0ubuntu1, 7.1.4+16.04.20180209.1-0ubuntu1), libatomic1:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), libvorbis0a:i386 (1.3.5-3, 1.3.5-3ubuntu0.1), libbind9-140:i386 (1:9.10.3.dfsg.P4-8ubuntu1.9, 1:9.10.3.dfsg.P4-8ubuntu1.10), cups-daemon:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), libtasn1-6:i386 (4.7-3ubuntu0.16.04.2, 4.7-3ubuntu0.16.04.3), libcc1-0:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), xserver-xorg-video-radeon-hwe-16.04:i386 (1:7.9.0-0ubuntu1~16.04.1, 1:7.10.0-1~16.04.1), libcupsimage2:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), libpython2.7-stdlib:i386 (2.7.12-1ubuntu0~16.04.1, 2.7.12-1ubuntu0~16.04.3), libpoppler-glib8:i386 (0.41.0-0ubuntu1.5, 0.41.0-0ubuntu1.6), libpython3.5-minimal:i386 (3.5.2-2ubuntu0~16.04.3, 3.5.2-2ubuntu0~16.04.4), libpoppler58:i386 (0.41.0-0ubuntu1.5, 0.41.0-0ubuntu1.6), libstdc++6:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.9), cups:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), pulseaudio-utils:i386 (1:8.0-0ubuntu3.4, 1:8.0-0ubuntu3.7), curl:i386 (7.47.0-1ubuntu2.4, 7.47.0-1ubuntu2.6), libdpkg-perl:i386 (1.18.4ubuntu1.2, 1.18.4ubuntu1.3), libcupscgi1:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), cups-client:i386 (2.1.3-4ubuntu0.3, 2.1.3-4ubuntu0.4), libjavascriptcoregtk-4.0-18:i386 (2.18.3-0ubuntu0.16.04.1, 2.18.6-0ubuntu0.16.04.1), klibc-utils:i386 (2.0.4-8ubuntu1.16.04.3, 2.0.4-8ubuntu1.16.04.4), libmbim-glib4:i386 (1.12.2-2ubuntu1, 1.14.0-1ubuntu0.16.04.1), update-notifier:i386 (3.168.5, 3.168.7), python3-problem-report:i386 (2.20.1-0ubuntu2.12, 2.20.1-0ubuntu2.15), ubuntu-mono:i386 (14.04+16.04.20161024-0ubuntu1, 14.04+16.04.20171116-0ubuntu1), python-minimal:i386 (2.7.11-1, 2.7.12-1~16.04), libgweather-common:i386 (3.18.2-0ubuntu0.1, 3.18.2-0ubuntu0.2), libaudit1:i386 (1:2.4.5-1ubuntu2, 1:2.4.5-1ubuntu2.1), initramfs-tools-core:i386 (0.122ubuntu8.9, 0.122ubuntu8.10), libcurl3-gnutls:i386 (7.47.0-1ubuntu2.4, 7.47.0-1ubuntu2.6), initramfs-tools:i386 (0.122ubuntu8.9, 0.122ubuntu8.10), xserver-xorg-video-ati-hwe-16.04:i386 (1:7.9.0-0ubuntu1~16.04.1, 1:7.10.0-1~16.04.1), gir1.2-javascriptcoregtk-4.0:i386 (2.18.3-0ubuntu0.16.04.1, 2.18.6-0ubuntu0.16.04.1), libssl1.0.0:i386 (1.0.2g-1ubuntu4.9, 1.0.2g-1ubuntu4.10), dpkg-dev:i386 (1.18.4ubuntu1.2, 1.18.4ubuntu1.3), python-all-dev:i386 (2.7.11-1, 2.7.12-1~16.04)
End-Date: 2018-02-21  15:06:39

Start-Date: 2018-02-22  00:45:57
Commandline: apt-get dist-upgrade
Requested-By: user (1000)
Install: linux-headers-4.4.0-116:i386 (4.4.0-116.140, automatic), libatkmm-1.6-1v5:i386 (2.24.2-1, automatic), libsigc++-2.0-0v5:i386 (2.6.2-1, automatic), linux-image-extra-4.13.0-36-generic:i386 (4.13.0-36.40~16.04.1, automatic), libqmi-glib5:i386 (1.16.2-1ubuntu0.16.04.1, automatic), linux-image-extra-4.4.0-116-generic:i386 (4.4.0-116.140, automatic), linux-headers-4.13.0-36-generic:i386 (4.13.0-36.40~16.04.1, automatic), libllvm5.0:i386 (1:5.0-3~16.04.1, automatic), pavucontrol:i386 (3.0-3build1, automatic), linux-headers-4.13.0-36:i386 (4.13.0-36.40~16.04.1, automatic), linux-headers-4.4.0-116-generic:i386 (4.4.0-116.140, automatic), libcairomm-1.0-1v5:i386 (1.12.0-1, automatic), libglibmm-2.4-1v5:i386 (2.46.3-1, automatic), libpangomm-1.4-1v5:i386 (2.38.1-1, automatic), linux-image-4.13.0-36-generic:i386 (4.13.0-36.40~16.04.1, automatic), linux-image-4.4.0-116-generic:i386 (4.4.0-116.140, automatic), libdrm-common:i386 (2.4.83-1~16.04.1, automatic), libgtkmm-3.0-1v5:i386 (3.18.0-1, automatic)
Upgrade: libqmi-proxy:i386 (1.12.6-1, 1.16.2-1ubuntu0.16.04.1), linux-headers-generic:i386 (4.4.0.101.106, 4.4.0.116.122), linux-image-generic-hwe-16.04:i386 (4.10.0.40.42, 4.13.0.36.55), linux-image-generic:i386 (4.4.0.101.106, 4.4.0.116.122), linux-generic-hwe-16.04:i386 (4.10.0.40.42, 4.13.0.36.55), libxatracker2:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), libegl1-mesa:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), lubuntu-desktop:i386 (0.65.2, 0.65.3), libgbm1:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), libdrm-amdgpu1:i386 (2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), libwayland-egl1-mesa:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), libmm-glib0:i386 (1.4.12-1ubuntu1, 1.6.4-1ubuntu0.16.04.1), libdrm2:i386 (2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), libgl1-mesa-dri:i386 (17.0.7-0ubuntu0.16.04.2, 17.2.8-0ubuntu0~16.04.1), modemmanager:i386 (1.4.12-1ubuntu1, 1.6.4-1ubuntu0.16.04.1), linux-headers-generic-hwe-16.04:i386 (4.10.0.40.42, 4.13.0.36.55), linux-generic:i386 (4.4.0.101.106, 4.4.0.116.122)
End-Date: 2018-02-22  00:55:23

Start-Date: 2018-02-22  00:55:48
Commandline: apt-get autoremove
Requested-By: user (1000)
Remove: linux-headers-4.4.0-101:i386 (4.4.0-101.124), linux-image-4.4.0-101-generic:i386 (4.4.0-101.124), linux-image-extra-4.10.0-37-generic:i386 (4.10.0-37.41~16.04.1), libllvm4.0:i386 (1:4.0-1ubuntu1~16.04.2), linux-headers-4.10.0-37-generic:i386 (4.10.0-37.41~16.04.1), linux-image-extra-4.4.0-101-generic:i386 (4.4.0-101.124), linux-headers-4.4.0-101-generic:i386 (4.4.0-101.124), linux-headers-4.10.0-37:i386 (4.10.0-37.41~16.04.1), linux-image-4.10.0-37-generic:i386 (4.10.0-37.41~16.04.1)
End-Date: 2018-02-22  00:58:05

Additionally, this message has been popping up occasionally: I'm not sure if it's related at all.

If there's any other information that would be helpful, let me know.