desculpem e que to aprendendo segue log
milton@milton-Positivo-Mobile:~$ sudo apt-get --purge remove linux-image-3.2.0-23-generic-pae
[sudo] password for milton:
Lendo listas de pacotes... Pronto
Construindo árvore de dependências
Lendo informação de estado... Pronto
Os seguintes pacotes foram instalados automaticamente e já não são necessários:
gir1.2-gconf-2.0 gir1.2-unique-3.0 python-lxml python-compizconfig
Use 'apt-get autoremove' para removê-los.
Os pacotes a seguir serão REMOVIDOS:
linux-image-3.2.0-23-generic-pae
0 pacotes atualizados, 0 pacotes novos instalados, 1 a serem removidos e 0 não atualizados.
1 pacotes não totalmente instalados ou removidos.
Depois desta operação, 113 MB de espaço em disco serão liberados.
Você quer continuar [S/n]? s
(Lendo banco de dados ... 148238 ficheiros e directórios actualmente instalados.)
Removendo linux-image-3.2.0-23-generic-pae ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.2.0-23-generic-pae /boot/vmlinuz-3.2.0-23-generic-pae
update-initramfs: Deleting /boot/initrd.img-3.2.0-23-generic-pae
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.2.0-23-generic-pae /boot/vmlinuz-3.2.0-23-generic-pae
/usr/sbin/grub-mkconfig: 37: /etc/default/grub: Syntax error: EOF in backquote substitution
run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2
Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.2.0-23-generic-pae.postrm line 328.
dpkg: erro processando linux-image-3.2.0-23-generic-pae (--remove):
sub-processo script post-removal instalado retornou estado de saída de erro 1
Erros foram encontrados durante o processamento de:
linux-image-3.2.0-23-generic-pae
E: Sub-process /usr/bin/dpkg returned an error code (1)
milton@milton-Positivo-Mobile:~$ sudo apt-get update
Ign
http://br.archive.ubuntu.com precise InRelease
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http://br.archive.ubuntu.com precise-updates InRelease
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Atingido
http://br.archive.ubuntu.com precise Release.gpg
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http://security.ubuntu.com precise-security InRelease
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http://ppa.launchpad.net precise InRelease
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http://br.archive.ubuntu.com precise-updates Release.gpg
Obter:1
http://security.ubuntu.com precise-security Release.gpg [198 B]
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http://br.archive.ubuntu.com precise-backports Release.gpg
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http://ppa.launchpad.net precise Release.gpg
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http://security.ubuntu.com precise-security Release [49,6 kB]
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http://br.archive.ubuntu.com precise-updates/multiverse TranslationIndex
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http://ppa.launchpad.net precise/main Sources
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http://ppa.launchpad.net precise/main i386 Packages
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http://ppa.launchpad.net precise/main TranslationIndex
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Obter:3
http://security.ubuntu.com precise-security/main Sources [18,4 kB]
Atingido
http://ppa.launchpad.net precise/main Sources
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http://ppa.launchpad.net precise/main i386 Packages
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Obter:4
http://security.ubuntu.com precise-security/restricted Sources [14 B]
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http://security.ubuntu.com precise-security/universe Sources [5.337 B]
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http://security.ubuntu.com precise-security/multiverse Sources [713 B]
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http://security.ubuntu.com precise-security/main i386 Packages [59,5 kB]
Atingido
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http://br.archive.ubuntu.com precise-updates/universe Translation-en
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http://br.archive.ubuntu.com precise-backports/main Translation-en
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http://br.archive.ubuntu.com precise-backports/multiverse Translation-en
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http://br.archive.ubuntu.com precise-backports/restricted Translation-en
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http://br.archive.ubuntu.com precise-backports/universe Translation-en
Obter:8
http://security.ubuntu.com precise-security/restricted i386 Packages [14 B]
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http://security.ubuntu.com precise-security/universe i386 Packages [13,0 kB]
Obter:10
http://security.ubuntu.com precise-security/multiverse i386 Packages [1.394 B]
Atingido
http://security.ubuntu.com precise-security/main TranslationIndex
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http://security.ubuntu.com precise-security/multiverse TranslationIndex
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http://security.ubuntu.com precise-security/universe TranslationIndex
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http://security.ubuntu.com precise-security/main Translation-en
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http://security.ubuntu.com precise-security/multiverse Translation-en
Atingido
http://security.ubuntu.com precise-security/restricted Translation-en
Atingido
http://security.ubuntu.com precise-security/universe Translation-en
Ign
http://extras.ubuntu.com precise/main Translation-pt_BR
Ign
http://extras.ubuntu.com precise/main Translation-pt
Ign
http://ppa.launchpad.net precise/main Translation-pt_BR
Ign
http://ppa.launchpad.net precise/main Translation-pt
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http://ppa.launchpad.net precise/main Translation-pt_BR
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Baixados 148 kB em 13s (10,6 kB/s)
Lendo listas de pacotes... Pronto
milton@milton-Positivo-Mobile:~$ sudo apt-get install -f
Lendo listas de pacotes... Pronto
Construindo árvore de dependências
Lendo informação de estado... Pronto
Os seguintes pacotes foram instalados automaticamente e já não são necessários:
gir1.2-gconf-2.0 gir1.2-unique-3.0 python-lxml python-compizconfig
Use 'apt-get autoremove' para removê-los.
Os pacotes a seguir serão REMOVIDOS:
linux-image-3.2.0-23-generic-pae
0 pacotes atualizados, 0 pacotes novos instalados, 1 a serem removidos e 0 não atualizados.
1 pacotes não totalmente instalados ou removidos.
Depois desta operação, 113 MB de espaço em disco serão liberados.
Você quer continuar [S/n]? s
(Lendo banco de dados ... 148238 ficheiros e directórios actualmente instalados.)
Removendo linux-image-3.2.0-23-generic-pae ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.2.0-23-generic-pae /boot/vmlinuz-3.2.0-23-generic-pae
update-initramfs: Deleting /boot/initrd.img-3.2.0-23-generic-pae
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.2.0-23-generic-pae /boot/vmlinuz-3.2.0-23-generic-pae
/usr/sbin/grub-mkconfig: 37: /etc/default/grub: Syntax error: EOF in backquote substitution
run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 2
Failed to process /etc/kernel/postrm.d at /var/lib/dpkg/info/linux-image-3.2.0-23-generic-pae.postrm line 328.
dpkg: erro processando linux-image-3.2.0-23-generic-pae (--remove):
sub-processo script post-removal instalado retornou estado de saída de erro 1
Erros foram encontrados durante o processamento de:
linux-image-3.2.0-23-generic-pae
E: Sub-process /usr/bin/dpkg returned an error code (1)
milton@milton-Positivo-Mobile:~$
Como o Creto falou, preciso ver as saídas dos comandos indicados. Eles não são para remover nada, mas para outras finalidades, uma delas é resolver pacotes quebrados.