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Ver información sobre un paquete en Debian/Ubuntu

En Ubuntu, y Debian en general, para obtener información de un paquete que tenemos o no instalado podemos usar apt-cache o aptitude:

En ambos comandos mediante show podemos ver información del paquete:

# apt-cache show lldpd
Package: lldpd
Version: 0.5.7-2
Architecture: armhf
Maintainer: Vincent Bernat <bernat@debian.org>
Installed-Size: 234
Depends: libc6 (>= 2.13-28), libsnmp15 (>= 5.4.3~dfsg), libxml2 (>= 2.7.4), adduser
Suggests: snmpd
Homepage: https://github.com/vincentbernat/lldpd
Priority: optional
Section: net
Filename: pool/main/l/lldpd/lldpd_0.5.7-2_armhf.deb
Size: 96432
SHA256: 37c6e0586f013070bdaaa30471827a4cbc264b21b404004a07bfb6ebe2f1cadb
SHA1: a42e228e8293e7f415c2bf41e30abb29ac4f838a
MD5sum: 616adbc6bf19b2928dca68da89af3570
Description: implementation of IEEE 802.1ab (LLDP)
 LLDP is an industry standard protocol designed to supplant
 proprietary Link-Layer protocols such as Extreme's EDP (Extreme
 Discovery Protocol) and CDP (Cisco Discovery Protocol). The goal of
 LLDP is to provide an inter-vendor compatible mechanism to deliver
 Link-Layer notifications to adjacent network devices.
 .
 This implementation provides LLDP sending and reception, supports
 VLAN and includes an SNMP subagent that can interface to an SNMP
 agent through AgentX protocol.
 .
 This daemon is also able to deal with CDP, SONMP, FDP and EDP
 protocol. It also handles LLDP-MED extension.

En el caso de usar aptitude, podemos ver además si esta instalado o no en el equipo:

# aptitude show lldpd
Package: lldpd                           
State: installed
Automatically installed: no
Version: 0.5.7-2
Priority: optional
Section: net
Maintainer: Vincent Bernat <bernat@debian.org>
Architecture: armhf
Uncompressed Size: 240 k
Depends: libc6 (>= 2.13-28), libsnmp15 (>= 5.4.3~dfsg), libxml2 (>= 2.7.4), adduser
Suggests: snmpd
Description: implementation of IEEE 802.1ab (LLDP)
 LLDP is an industry standard protocol designed to supplant proprietary Link-Layer protocols such as Extreme's EDP (Extreme Discovery Protocol) and
 CDP (Cisco Discovery Protocol). The goal of LLDP is to provide an inter-vendor compatible mechanism to deliver Link-Layer notifications to adjacent
 network devices. 
 
 This implementation provides LLDP sending and reception, supports VLAN and includes an SNMP subagent that can interface to an SNMP agent through
 AgentX protocol. 
 
 This daemon is also able to deal with CDP, SONMP, FDP and EDP protocol. It also handles LLDP-MED extension.
Homepage: https://github.com/vincentbernat/lldpd

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