I am trying to install TDE on my Ubuntu 11.04 system.
I have added all four repositories and GPG key as described in http://www.trinitydesktop.org/installation.php#ubuntu

Than I run the command "sudo apt-get install kubuntu-default-settings-trinity kubuntu-desktop-trinity" to install TDE. It downloads all files and when it start it tries to remove SUDO.

Here are the command output:

bimal@bimal-homelinux:~$ sudo apt-get install kubuntu-default-settings-trinity kubuntu-desktop-trinity
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
linux-headers-2.6.38-8 libopenjpeg2 linux-headers-2.6.38-8-generic
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
acpi adept-batch-trinity adept-common-trinity adept-installer-trinity adept-manager-trinity adept-notifier-trinity adept-trinity
adept-updater-trinity akregator-trinity amarok-common-trinity amarok-engine-xine-trinity amarok-trinity ark-trinity arts-trinity
bluetooth bluez-utils cdparanoia cdrdao cryptsetup crystalcursors cups-pdf debtags desktop-effects-kde-trinity digikam-trinity
enscript foomatic-db-gutenprint fortune-mod fortunes-min freeglut3 gir1.2-gudev-1.0 gnupg-agent gpgsm gtk-qt-engine-trinity
gtk2-engines-qtcurve guidance-backends-trinity gwenview-trinity hal hal-info hal-trinity hpijs-ppds ijsgutenprint imagemagick
k3b-data-trinity k3b-trinity kaddressbook-trinity kaffeine-trinity kamera-trinity kappfinder-trinity karm-trinity katapult-trinity
kate-trinity kbstate-trinity kcontrol-trinity kcron-trinity kdbusnotification-trinity kde-guidance-powermanager-trinity
kde-guidance-trinity kde-style-qtcurve-trinity kde-systemsettings-trinity kdeadmin-kfile-plugins-trinity kdebase-data-trinity
kdebase-kio-plugins-trinity kdebase-runtime-data-common-trinity kdebase-trinity kdebase-trinity-bin
kdegraphics-kfile-plugins-trinity kdelibs-data-trinity kdelibs4c2a-trinity kdemultimedia-kfile-plugins-trinity
kdemultimedia-kio-plugins-trinity kdenetwork-filesharing-trinity kdenetwork-kfile-plugins-trinity kdepasswd-trinity
kdepim-kio-plugins-trinity kdepim-kresources-trinity kdepim-wizards-trinity kdeprint-trinity kdesktop-trinity kdesudo-trinity
kdm-trinity kdmtheme-trinity kdnssd-trinity keep-trinity kfind-trinity kghostview-trinity kgtk-qt3-trinity khelpcenter-trinity
kicker-trinity kio-apt-trinity kio-locate-trinity kio-umountwrapper-trinity kipi-plugins-trinity klipper-trinity kmag-trinity
kmail-trinity kmailcvt-trinity kmenuedit-trinity kmilo-trinity kmix-trinity kmousetool-trinity kmplayer-base-trinity
kmplayer-konq-plugins-trinity knetworkconf-trinity knode-trinity knotes-trinity konq-plugins-trinity konqueror-nsplugins-trinity
konqueror-trinity konsole-trinity kontact-trinity konversation-trinity kooka-trinity kopete-trinity korganizer-trinity
kpackage-trinity kpager-trinity kpdf-trinity kpersonalizer-trinity kpf-trinity kppp-trinity krdc-trinity kregexpeditor-trinity
krfb-trinity kscreensaver-trinity kscreensaver-xsavers-trinity ksmserver-trinity ksnapshot-trinity ksplash-engine-moodin-trinity
ksplash-trinity ksvg-trinity ksysguard-trinity ksysguardd-trinity ksystemlog-trinity ktip-trinity ktorrent-trinity
kubuntu-kdm-themes kubuntu-konqueror-shortcuts-trinity kvkbd-trinity kwalletmanager-trinity kwin-style-crystal-trinity kwin-trinity
landscape-client landscape-common libakode2 libao-common libao4 libarts1-akode-trinity libarts1c2a-trinity libartsc0-trinity
libavahi-tqt-1 libcaldav libcarddav libcdt4 libdbus-tqt-1-1c2 libept0-trinity libexpat1-dev libflac++6 libglut3 libgraph4 libgvc5
libhal-storage1 libhal1 libifp4 libindex0-trinity libjpeg-progs libjpeg8 libk3b3-extracodecs-trinity libk3b3-trinity
libkcal2b-trinity libkcddb1-trinity libkdcraw3-trinity libkdepim1a-trinity libkexiv2-3-trinity libkipi0-trinity
libkleopatra1-trinity libkmime2-trinity libkonq4-trinity libkpimexchange1-trinity libkpimidentities1-trinity libksba8
libkscan1-trinity libksieve0-trinity libktnef1-trinity liblqr-1-0 libmagickcore3 libmagickcore3-extra libmagickwand3
libmimelib1c2a-trinity libmpg123-0 libnetpbm10 libnjb5 libpathplan4 libpoppler-tqt libpythonize0-trinity libqt-perl libqt3-mt
libqt4-designer libqt4-help libqt4-scripttools libqt4-test libqtassistantclient4 librecode0 librpm1 librpmbuild1 librpmio1
librsync1 libruby1.8 libscim8c2a libsmokeqt1-trinity libssl-dev libtqt3-integration-trinity libtqtinterface libtunepimp5
libuniconf4.6 libwvstreams4.6-base libwvstreams4.6-extras libxine1 libxine1-bin libxine1-console libxine1-misc-plugins libxine1-x
mpg123 ncompress netpbm ocrad openoffice.org-calc openoffice.org-impress openoffice.org-writer p7zip-full perl-suid pinentry-gtk2
pmount poster postfix powermanagement-interface procmail psutils pykdeextensions-trinity python-dev python-pylibacl python-pyxattr
python-qt3 python-qt4 python-sip python-smartpm python-trinity-trinity python2.7-dev qca-tls rdiff-backup rpm rpm-common rpm2cpio
ruby ruby1.8 scim scim-bridge-agent scim-bridge-client-gtk scim-bridge-client-qt scim-gtk2-immodule scim-modules-socket scim-qtimm
screen smartdimmer speedcrunch strigi-daemon sudo-trinity tde-ubuntu-integration ttf-arabeyes ttf-arphic-ukai ttf-arphic-uming
ttf-bitstream-vera ttf-kochi-gothic ttf-kochi-mincho ttf-malayalam-fonts ttf-sazanami-mincho unison vorbis-tools wvdial
xbase-clients xcalib zlib1g-dev zoo
Suggested packages:
libqt0-ruby1.8 amarok-engines-trinity moodbar rar busybox tagcoll digikam-trinity-doc fortunes kde-style-qtcurve gwenview-i18n
gnome-device-manager imagemagick-doc autotrace curl ffmpeg gnuplot grads hp2xx html2ps libwmf-bin mplayer povray radiance
texlive-base-bin transfig ufraw-batch k3b-i18n normalize-audio toolame sox movixmaker-2 vcdimager kate-plugins-trinity
kdebase-trinity-doc-html fam egroupware efax hylafax-client mgetty-fax menu htdig kicker-applets-trinity gallery
kipi-plugins-trinity-doc kleopatra-trinity clamav f-prot-installer kdeaddons-trinity-doc-html gij-4.1 libgcj7-awt libjessie-java
knewsticker-trinity kweather-trinity gnokii libsoap-lite-perl kdeartwork-emoticons-trinity gnomemeeting
kscreensaver-xsavers-webcollage-trinity hplip-gui python-image-store-proxy libarts1-akode libqt3-mt-psql libqt3-mt-mysql
libqt3-mt-odbc gxine xine-ui libxine1-doc libxine-doc libxine1-ffmpeg p7zip-rar pinentry-doc postfix-mysql postfix-pgsql
postfix-ldap postfix-pcre sasl2-bin dovecot-common resolvconf postfix-cdb python-pylibacl-dbg python-pyxattr-dbg python-qt3-gl
python-qt3-doc python-qt4-dbg alien elfutils rpm-i18n ri ruby-dev ruby1.8-examples ri1.8 scim-uim scim-pinyin scim-hangul
scim-chewing scim-m17n scim-prime scim-anthy scim-skk scim-canna scim-tables-additional scim-tables-ja scim-tables-ko
scim-tables-zh scim-thai byobu strigi-plugins xserver-xfree86 xserver xfs icc-profiles
Recommended packages:
kubuntu-docs-trinity networkstatus-trinity openoffice.org-trinity pinentry-qt powernowd skim system-config-printer-kde-trinity
plymouth-theme-kubuntu-logo-trinity default-mta mail-transport-agent fetchmail
The following packages will be REMOVED:
sudo
The following NEW packages will be installed:
acpi adept-batch-trinity adept-common-trinity adept-installer-trinity adept-manager-trinity adept-notifier-trinity adept-trinity
adept-updater-trinity akregator-trinity amarok-common-trinity amarok-engine-xine-trinity amarok-trinity ark-trinity arts-trinity
bluetooth bluez-utils cdparanoia cdrdao cryptsetup crystalcursors cups-pdf debtags desktop-effects-kde-trinity digikam-trinity
enscript foomatic-db-gutenprint fortune-mod fortunes-min freeglut3 gir1.2-gudev-1.0 gnupg-agent gpgsm gtk-qt-engine-trinity
gtk2-engines-qtcurve guidance-backends-trinity gwenview-trinity hal hal-info hal-trinity hpijs-ppds ijsgutenprint imagemagick
k3b-data-trinity k3b-trinity kaddressbook-trinity kaffeine-trinity kamera-trinity kappfinder-trinity karm-trinity katapult-trinity
kate-trinity kbstate-trinity kcontrol-trinity kcron-trinity kdbusnotification-trinity kde-guidance-powermanager-trinity
kde-guidance-trinity kde-style-qtcurve-trinity kde-systemsettings-trinity kdeadmin-kfile-plugins-trinity kdebase-data-trinity
kdebase-kio-plugins-trinity kdebase-runtime-data-common-trinity kdebase-trinity kdebase-trinity-bin
kdegraphics-kfile-plugins-trinity kdelibs-data-trinity kdelibs4c2a-trinity kdemultimedia-kfile-plugins-trinity
kdemultimedia-kio-plugins-trinity kdenetwork-filesharing-trinity kdenetwork-kfile-plugins-trinity kdepasswd-trinity
kdepim-kio-plugins-trinity kdepim-kresources-trinity kdepim-wizards-trinity kdeprint-trinity kdesktop-trinity kdesudo-trinity
kdm-trinity kdmtheme-trinity kdnssd-trinity keep-trinity kfind-trinity kghostview-trinity kgtk-qt3-trinity khelpcenter-trinity
kicker-trinity kio-apt-trinity kio-locate-trinity kio-umountwrapper-trinity kipi-plugins-trinity klipper-trinity kmag-trinity
kmail-trinity kmailcvt-trinity kmenuedit-trinity kmilo-trinity kmix-trinity kmousetool-trinity kmplayer-base-trinity
kmplayer-konq-plugins-trinity knetworkconf-trinity knode-trinity knotes-trinity konq-plugins-trinity konqueror-nsplugins-trinity
konqueror-trinity konsole-trinity kontact-trinity konversation-trinity kooka-trinity kopete-trinity korganizer-trinity
kpackage-trinity kpager-trinity kpdf-trinity kpersonalizer-trinity kpf-trinity kppp-trinity krdc-trinity kregexpeditor-trinity
krfb-trinity kscreensaver-trinity kscreensaver-xsavers-trinity ksmserver-trinity ksnapshot-trinity ksplash-engine-moodin-trinity
ksplash-trinity ksvg-trinity ksysguard-trinity ksysguardd-trinity ksystemlog-trinity ktip-trinity ktorrent-trinity
kubuntu-default-settings-trinity kubuntu-desktop-trinity kubuntu-kdm-themes kubuntu-konqueror-shortcuts-trinity kvkbd-trinity
kwalletmanager-trinity kwin-style-crystal-trinity kwin-trinity landscape-client landscape-common libakode2 libao-common libao4
libarts1-akode-trinity libarts1c2a-trinity libartsc0-trinity libavahi-tqt-1 libcaldav libcarddav libcdt4 libdbus-tqt-1-1c2
libept0-trinity libexpat1-dev libflac++6 libglut3 libgraph4 libgvc5 libhal-storage1 libhal1 libifp4 libindex0-trinity libjpeg-progs
libjpeg8 libk3b3-extracodecs-trinity libk3b3-trinity libkcal2b-trinity libkcddb1-trinity libkdcraw3-trinity libkdepim1a-trinity
libkexiv2-3-trinity libkipi0-trinity libkleopatra1-trinity libkmime2-trinity libkonq4-trinity libkpimexchange1-trinity
libkpimidentities1-trinity libksba8 libkscan1-trinity libksieve0-trinity libktnef1-trinity liblqr-1-0 libmagickcore3
libmagickcore3-extra libmagickwand3 libmimelib1c2a-trinity libmpg123-0 libnetpbm10 libnjb5 libpathplan4 libpoppler-tqt
libpythonize0-trinity libqt-perl libqt3-mt libqt4-designer libqt4-help libqt4-scripttools libqt4-test libqtassistantclient4
librecode0 librpm1 librpmbuild1 librpmio1 librsync1 libruby1.8 libscim8c2a libsmokeqt1-trinity libssl-dev
libtqt3-integration-trinity libtqtinterface libtunepimp5 libuniconf4.6 libwvstreams4.6-base libwvstreams4.6-extras libxine1
libxine1-bin libxine1-console libxine1-misc-plugins libxine1-x mpg123 ncompress netpbm ocrad openoffice.org-calc
openoffice.org-impress openoffice.org-writer p7zip-full perl-suid pinentry-gtk2 pmount poster postfix powermanagement-interface
procmail psutils pykdeextensions-trinity python-dev python-pylibacl python-pyxattr python-qt3 python-qt4 python-sip python-smartpm
python-trinity-trinity python2.7-dev qca-tls rdiff-backup rpm rpm-common rpm2cpio ruby ruby1.8 scim scim-bridge-agent
scim-bridge-client-gtk scim-bridge-client-qt scim-gtk2-immodule scim-modules-socket scim-qtimm screen smartdimmer speedcrunch
strigi-daemon sudo-trinity tde-ubuntu-integration ttf-arabeyes ttf-arphic-ukai ttf-arphic-uming ttf-bitstream-vera ttf-kochi-gothic
ttf-kochi-mincho ttf-malayalam-fonts ttf-sazanami-mincho unison vorbis-tools wvdial xbase-clients xcalib zlib1g-dev zoo
0 upgraded, 284 newly installed, 1 to remove and 1 not upgraded.
Need to get 0 B/272 MB of archives.
After this operation, 829 MB of additional disk space will be used.
Do you want to continue [Y/n]? y
Extracting templates from packages: 100%
Preconfiguring packages ...
dpkg: sudo: dependency problems, but removing anyway as you requested:
ubuntu-minimal depends on sudo.
gksu depends on sudo.
(Reading database ... 195609 files and directories currently installed.)
Removing sudo ...
You have asked that the sudo package be removed,
but no root password has been set.
Without sudo, you may not be able to gain administrative privileges.
If you would prefer to access the root account with su(1)
or by logging in directly,
you must set a root password with "sudo passwd".
If you have arranged other means to access the root account,
and you are sure this is what you want,
you may bypass this check by setting an environment variable
(export SUDO_FORCE_REMOVE=yes).
Refusing to remove sudo.
dpkg: error processing sudo (--remove):
subprocess installed pre-removal script returned error exit status 1
Errors were encountered while processing:
sudo
E: Sub-process /usr/bin/dpkg returned an error code (1)

How to solve this so I can install the TDE on my Ubuntu system?

Thanks