desde hace mas de 2 meses que no puedo instalar aplicaciones de la forma normal en los repositorios de Ubuntu, siempre me dice que no se encuentran ciertos directorios o paquetes. Antes me salia esto solamente

Ign:107 http://ubuntu.uci.cu/ubuntu bionic-proposed/universe DEP-11 64×64@2 Icons
Des:108 http://ubuntu.uci.cu/ubuntu bionic-proposed/universe DEP-11 128×128 Icons [16,3 kB]
Err:108 http://ubuntu.uci.cu/ubuntu bionic-proposed/universe DEP-11 128×128 Icons
Err:13 http://ubuntu.uci.cu/ubuntu bionic/main DEP-11 64×64@2 Icons
404 Not Found [IP: 10.0.0.22 80]
Ign:62 http://ubuntu.uci.cu/ubuntu bionic/universe DEP-11 64×64@2 Icons
Ign:63 http://ubuntu.uci.cu/ubuntu bionic/multiverse DEP-11 64×64@2 Icons
Ign:109 http://ubuntu.uci.cu/ubuntu bionic-backports/universe amd64 DEP-11 Metadata
Ign:110 http://ubuntu.uci.cu/ubuntu bionic-backports/universe DEP-11 64×64@2 Icons

Ahora me sale tambien esto:

E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-updates/universe/dep11/icons-128×128.tar.gz
E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-updates/multiverse/dep11/Components-amd64.yml.xz
E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-proposed/main/dep11/Components-amd64.yml.xz El archivo tiene un tamaño inesperado (35804 != 35856). ¿La sincronización de la réplica está en progreso? [IP: 10.0.0.22 80]
Hashes of expected file:
– Filesize:35856 [weak]
– SHA256:e3b512c90560bedf2c4c70cd1efc7b27b2e8366a24363aafd09ac989389432cc
– SHA1:3230a0a9093362dad64de0733652cf3a9aa43299 [weak]
– MD5Sum:b9215f60058d2e96d8a219eda6d1c6d6 [weak]
Release file created at: Tue, 22 Jan 2019 03:46:52 +0000
E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-proposed/universe/dep11/Components-amd64.yml.xz
E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-proposed/universe/dep11/icons-64×64.tar.gz
E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-proposed/universe/dep11/icons-128×128.tar.gz
E: Fallo al obtener http://ubuntu.uci.cu/ubuntu/dists/bionic-backports/universe/dep11/Components-amd64.yml.xz La suma hash difiere
Hashes of expected file:
– Filesize:7344 [weak]
– SHA256:3b75d1f2d6d9d34b74d0d983941247207d1e1238a9e9727ede59c2ec660bd6ec
– SHA1:8e5ba03598949d449c72501369ff995fdb306c07 [weak]
– MD5Sum:1625a4723ee4e2a04b481f92d594101a [weak]
Hashes of received file:
– SHA256:c2c6f01d152f40f27112f91598ae19dff6177078fbd2b51d57dae618b169a936
– SHA1:4e6501297464ada1caa1d8ff1717e788b58264ba [weak]
– MD5Sum:a1536bcaa4a1d51516b2a73953df0897 [weak]
– Filesize:7344 [weak]