my laptop: window 7 32 bit. cs50 appliance: linux 2.6/3.x (64bit)
I can not launch gedit. Terminal works. Chrome works. When i click on gedit it gives me the following message (see attachment). I have tried "sudo apt-get update" and "sudo apt-get upgrade" and "sudo apt-get update --reinstall gedit" but it did not solved the issue. I have tried relaunching the cs50 appliance but had no success. 
update: I tried to do as shown in the video https://www.youtube.com/watch?v=kcoRaJLMX-U&feature=youtu.be
I have this (a copy of terminal below). Gedit still does not work.
jharvard@appliance (~): gedit
/usr/bin/gedit: line 4: 4214 Segmentation fault (core dumped) /usr/bin/gedit.appliance50-orig "$@" 2> /dev/null
jharvard@appliance (~): sudo apt-get update
Ign http://dl.google.com stable InRelease
Get:1 http://mirror.cs50.net InRelease [2085 B]
Get:2 http://dl.google.com stable Release.gpg [198 B]
Get:3 http://dl.google.com stable Release [1347 B]
Ign http://linux.dropbox.com trusty InRelease
Get:4 http://mirror.cs50.net Packages [2770 B]
Get:5 http://dl.google.com stable/main i386 Packages [1196 B]
Hit http://linux.dropbox.com trusty Release.gpg
Hit http://linux.dropbox.com trusty Release
Hit http://linux.dropbox.com trusty/main amd64 Packages
Ign http://dl.google.com stable/main Translation-en
Hit http://linux.dropbox.com trusty/main i386 Packages
Ign http://mirror.cs50.net Translation-en
Ign http://linux.dropbox.com trusty/main Translation-en
Ign http://us.archive.ubuntu.com trusty InRelease
Ign http://us.archive.ubuntu.com trusty-updates InRelease
Ign http://us.archive.ubuntu.com trusty-backports InRelease
Hit http://us.archive.ubuntu.com trusty Release.gpg
Get:6 http://us.archive.ubuntu.com trusty-updates Release.gpg [933 B]
Hit http://us.archive.ubuntu.com trusty-backports Release.gpg
Hit http://us.archive.ubuntu.com trusty Release
Get:7 http://us.archive.ubuntu.com trusty-updates Release [62.0 kB]
Hit http://us.archive.ubuntu.com trusty-backports Release
Hit http://us.archive.ubuntu.com trusty/main Sources
Hit http://us.archive.ubuntu.com trusty/restricted Sources
Hit http://us.archive.ubuntu.com trusty/universe Sources
Hit http://us.archive.ubuntu.com trusty/multiverse Sources
Hit http://us.archive.ubuntu.com trusty/main i386 Packages
Hit http://us.archive.ubuntu.com trusty/restricted i386 Packages
Hit http://us.archive.ubuntu.com trusty/universe i386 Packages
Hit http://us.archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://us.archive.ubuntu.com trusty/main Translation-en
Get:8 http://us.archive.ubuntu.com trusty/multiverse Translation-en [102 kB]
Get:9 http://us.archive.ubuntu.com trusty/restricted Translation-en [3457 B]
Hit http://us.archive.ubuntu.com trusty/universe Translation-en
Get:10 http://us.archive.ubuntu.com trusty-updates/main Sources [177 kB]
Ign http://security.ubuntu.com trusty-security InRelease
Get:11 http://security.ubuntu.com trusty-security Release.gpg [933 B]
Get:12 http://security.ubuntu.com trusty-security Release [62.0 kB]
Get:13 http://security.ubuntu.com trusty-security/main Sources [65.3 kB]
Get:14 http://security.ubuntu.com trusty-security/restricted Sources [2061 B]
Get:15 http://security.ubuntu.com trusty-security/universe Sources [17.4 kB]
Get:16 http://security.ubuntu.com trusty-security/multiverse Sources [1896 B]
Get:17 http://security.ubuntu.com trusty-security/main i386 Packages [191 kB]
Err http://us.archive.ubuntu.com trusty-updates/restricted Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/universe Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/multiverse Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/main i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/restricted i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/universe i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/multiverse i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/main Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/multiverse Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/restricted Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-updates/universe Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/main Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/restricted Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/universe Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/multiverse Sources
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/main i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/restricted i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/universe i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/multiverse i386 Packages
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/main Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/multiverse Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/restricted Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Err http://us.archive.ubuntu.com trusty-backports/universe Translation-en
Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
Get:18 http://security.ubuntu.com trusty-security/restricted i386 Packages [8846 B]
Get:19 http://security.ubuntu.com trusty-security/universe i386 Packages [85.4 kB]
Get:20 http://security.ubuntu.com trusty-security/multiverse i386 Packages [3624 B]
Get:21 http://security.ubuntu.com trusty-security/main Translation-en [101 kB]
Get:22 http://security.ubuntu.com trusty-security/multiverse Translation-en [1580 B]
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Get:23 http://security.ubuntu.com trusty-security/universe Translation-en [46.8 kB]
Fetched 941 kB in 6min 53s (2272 B/s)
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/source/Sources Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/binary-i386/Packages Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/main/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/multiverse/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/restricted/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/universe/i18n/Translation-en Unable to connect to us.archive.ubuntu.com:http: [IP: 2001:67c:1562::14 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/universe/i18n/Translation-en Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.
jharvard@appliance (~): sudo apt-get install --reinstall gedit
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
apt-clone archdetect-deb cifs-utils dmraid dpkg-repack firefox-locale-en
gir1.2-appindicator3-0.1 gir1.2-json-1.0 gir1.2-timezonemap-1.0
gir1.2-xkl-1.0 kpartx kpartx-boot libdebian-installer4
libdevmapper-event1.02.1 libdmraid1.0.0.rc16 libtimezonemap1
localechooser-data lvm2 python3-icu python3-pam rdate watershed
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 49 not upgraded.
Need to get 481 kB of archives.
After this operation, 0 B of additional disk space will be used.
Err http://us.archive.ubuntu.com/ubuntu/ trusty/main gedit i386 3.10.4-0ubuntu4
Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/g/gedit/gedit_3.10.4-0ubuntu4_i386.deb Cannot initiate the connection to us.archive.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
jharvard@appliance (~):
sudo apt-get install --reinstall gedit!